The place I buy my bees carry supplies and such. Ive bought a couple hundred unassembled frames last year Out of 200 I have a half dozen or so that have bowed or twisted. There frames are thinner than the ones I bought from Walter Kelly. They are the only ones I've bought other than my local supplier so, I don't have anything else to compair. I use Pierco foundation and these are what I've been using. Cost $0.95 ea. unassembled. Worth the money? I have a buddy heading over Thursday and I need more frames and foundation.