I'm in the process of switching my poster company from using POD to in-house production. I've bought all the stuff I need to produce them myself, but I can't find a decent metal poster frame for A2, A3 and A4 that cheap enough for my products. I can't seem to find one here that sells frames in A2, A3, and A4. I've looked through Alibaba and found these snap-poster frames which is pretty cool however the deal breaker is that the frames cover the poster with a thin sheet of flexible plastic, I'm looking for acrylic.
Can anyone guide me?
TLDR: Looking for a place where I can bulk buy Black Metal Poster Frames with Acrylic Windows for sizes A2, A3, A4.