I've purchased boxes and frames from Mann Lake and Western Bee. Western Bee had the best prices last year and they were most reasonable on shipping. I thought that the WB boxes were made of a lighter weight wood than Mann Lake, but I also thought that the WB boxes were built with tighter tolerances. HTH.
heres something you may not know-western bee mills the wooden ware for DADANT
and there is a connection between the two operations-RDY-B