In short $12
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It may seem obvious to state, but not all Sofrim provide the same quality of work and give the Mezuzahs the same level of attentions. Some do a quicker job just the bare minimum. while others hold the Mezuzahs to a higher standard to ensure its Kosher status. 

For this reason alone it is important to realize that when looking for a Sofer to check your Mezuzahs you must shop for their reputation of quality work not their price.

Being that a Sofer is being paid for their time. The cheaper the checking is more often then not an indication of a lower level of inspection, as less time is spent on each Mezuzah or someone less qualified is doing the checking, hence less cost.

I have seen unfortunately in many a Sofer Stam employing young students who are only just beginning to learn Safrus to do the checking even before they have received their Kabolah. or just eyeballing the Mezuzahs in short minute or two. (a physical impossibility) to ensure its Kosher status.

At the Sofer Center we spend 12-15 minutes per Mezuzah when checking, (not including time for rolling and putting back in the case.) 

We are not ok with your Mezuzahs just barley "passing" examination and we are highly qualified and certified.

When we check we are looking for;

• There are no missing, added or substituted letters or words.
• There are no touching or improperly spaced letters or words.
• That all the letters are written correctly,
• All the necessary crowns are there.
• Making minor repairs to faded and cracked letters or crowns.

There are times when a Mezuzah will require more work (for example if many of the letters or crowns on top of the letters are faded or cracked) and in that case we will advise if its worth to put the work into it or if its better off being replaced. in the event we agree to make the repairs we will give you a quote for the cost of the additional repairs.

In most cases we can accommodate same day checking but depending on our availability it is best to call and schedule ahead of time.

 Yes it does, however as far as a Brachah/Blessing is concerned it depends on the location of the garage. If it is adjoining or part of the house, such that one can exit the car and walk through a door into the house without leaving the garage all agree a Brachah/Blessing is recited. If however the garage is not adjoining or part of the house nor encircled by a gate that encompasses both it and the house  it is a matter of dispute and therefore a Brachah should not be recited.

The reason is to demonstrate our love for this Mitzvah.
There is a source to this custom in the Talmud regarding the conversion of the Roman Caesar’s men (Avodah Zarah 11b). Onkelos the son of Klonimus converted to Judaism. The Caesar, his uncle sent a legion of Roman soldiers to retrieve him. However, he enticed them to Judaism by quoting verses, and they converted to Judaism.The Caesar sent a new legion but this time he instructed them not to enter into conversation with his nephew. As they dragged him from his home, Onkelos saw the Mezuzah affixed to his doorpost. He placed his hand upon it to kiss it and asked them, “Do you know what this is?” The soldiers could not contain their curiosity and answered, “You tell us” Onkelos explained to them, “It is the custom of the world that the king sits in the inside of the palace, and the guards protect him from the outside. However, with G‑d, His servants are inside their homes and He protects them from the outside, as the verse says (Psalms 121:8), “G‑d will protect your departure and your arrival from now and forever. They were inspired and they too converted to Judaism. After that, the Caesar ceased sending soldiers to bring him back.
A right-handed person should use his right hand and a left-handed person should use their left hand.
It is permitted to kiss the Mezuzah even before one has washed his or her hands in the Morning since the Mezuzah is covered in a case.

When Removing Mezuzos for Checking the old nails, screws and tape previously used to affix the Mezuzos may be discarded. However, Mezuzah cases and Mezuzah wrappings if no longer needed should be treated as sacred material and require genizah/interment, after their use.

It is preferred to have all of the mezuzahs returned to their original doorposts, or at least to the same type of entrance way (i.e., from one bedroom door to another, or from one archway to another) in order that you don’t lower the status of a Mezuzah that was once on a door required Midoraisa (Biblical) to a entrance way that is only Rabbinical.

A practical suggestion: when removing the mezuzahs, label each mezuzah case with a number (using masking tape or the like). Tape an identical number on the doorpost from which it was removed. When the mezuzahs are remounted, match the numbers from your cases to the numbers on the doorposts.

When removing Mezuzos for Checking, or renovations are being done, or for any other reason when the Mezuzah is remounted, the blessing should be recited only if the Mezuzah was off the doorposts for at least one night. If you are also adding new Mezuzahs at this time, it is preferable to recite the blessing on a new one (providing that it is mounted on a door that requires a blessing).

Computer checkingIn addition to a Sofers examination, we strongly recommended you to have a computer checking done as well.

Although examiners do the best they can, humans can make mistakes which the computer can catch. However, it is not a substitute for the manual examination, for although the computer can successfully catch missing and substituted letters, it can not determine letters with a problematic shape if they are Kosher or not, or do the actual repairs if necessary. This can only be accomplished through a meticulous manual examination by a qualified Sofer.

The cost for a computer examination is minimal and a one time expense. If you have never had your Teffilin or Mezuzos computer checked, it is advisable to do so the next time you have them examined.