I won a gift certificate from the Drapers location in Iowa at a local bee club function. (There is another post relating to Western Bee Supply like this -- I was really lucky on the raffle.)
I recently used the gift certificate to buy some unassembled medium supers from them. They have two normal grades, and I bought the better one. The construction of the boxes is very good, with tight joints. The wood has some knots, but they are all tight. Their prices are good too.
All in all, a recommended product.