My first question would be are you still under warranty?
My second question would be, how comfortable are you with pulling the logic board yourself? I was a littel intimidated at first, but if you can follow directions well and can stay organized, it can be done, and this was my first time also.
I purchased a Macbook Pro from craigslist that said it needed a new logic board and was able to fix it. There is a certain procedure that can either save you a lot of money, or, leave you in the same position you are in right now which is needing a logic board. This will void any warranty you have, so do not try this if this is a new mac with a warranty.
I also recently moved to Louisville, so PM me and I can give you the details and some good information to reference.