Desperatly looking for print wallets!?

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I need plain white print wallets to hold 6"x4" prints and 7.5"x5" prints. Please, don't tell me to check out Smurfit as I already did and asked for some samples which I wasn't happy with. Not good enough quality, very thin paper. I want wallets made of very thick paper that actually holds the prints and protect them. I need about 100 of each (6"x4" and 7.5"x5"). Thanks in advance.