Hello all. I need some help. I typically buy new LP mailers from The Packaging Store in San Francisco to send out the LP's I sell. These measure approx. 12.5" x 12.5" x 1." I buy the NON variable depth model, as I find I can make a more secure package with this rather than the variable depth model. My problem is that the price on these has increased to over $4.00 per. I am looking for a cheaper source, but online, all I find are the variable depth mailers. Does anyone know where I can buy the non variable depth model at a good price. FWIW, the cat. number on the ones from the Pack. Store in SF is F7. Many thanks.