OBD2 is what they call the computer diagnostic system in your car, assuming you have a post 96' car. It stands for On Board Diagnostic, version 2, it just tends to be less tunable then the OBD1 computers, and thats why you hear so much about it.

As far as shops in the US, options auto salon, and inlinefour are pretty reliable sources online that ship world wide.

Good luck, later!