I ordered 27 basswood carving blocks (online) from Bell Forest (1.5x1.5, 2x2, 3x3, and 4x4 - all 12" long stock, but they have longer if you want).
They have all kinds of other woods as well, in case you guys ever need to get some. Here's the URL:
http://www.bellforestproducts.com/basswood/wood-blanks/