I don't think there are any fingerboard shops in the USA
but I would definitely recommend buying some online if you haven't.
Here is a list of sites you may find very intriguing:
Fingersized.com
Flatfacefingerboards.com
Blackriver-ramps.com
Nocomplyfingerboards.com is currently under construction and dealing with technical difficulties, but you can get some of their stuff from fingersized.com (which I highly recommend)
If you've not yet gotten a pair of wide trucks, you'll probably want to do that, or I'm sure Kerry(fingersized.com owner) would gladly hook you up with a set for free with an order of you don't have a set.
If you have any questions, just ask