so thats 6 new locks 4 coindoors and 2 backs the total cost is about 36 dollars is a lock smith gonna be cheaper?
Are you asking if it will cost less than $36 for a locksmith to come out to your site and do some work for you?
Generally expect to pay at least $100 for any site visit by Locksmith, Electrician, Plumber, etc, where they actually DO anything.