Al B is right, Warner Woods West sells only by mail order (maybe phone as well). Call them and they'll send you a price list. They"re pricey. I've never used them, but a couple of the members of my club have and these blocks look great.
I've used the Bluejacket blocks on a number of projects. They are very realisitic, but they are metal. You have to file off the rough edges from the casting process and then prime and paint them. The really small ones are a real bear to work with. But they do look good in the end.
You should also look at Model Expo (modelexpo-online.com). Some of their wooden blocks aren't too bad.
Ed.
VP, Long Island Ship Model Society
Member, NRG