Ron Hood sells some pretty stiff plastic bags (8 mil vinyl). A set of 5 bags , a "bag of bags" as he calls them, large and small sizes. 3"x5" and 6"x9".
I think the ETS survival kit bag by is 4"x5" IIRC from Aeromedix or possibly AMK.
Aloksak bags come in 4 sizes: 12"x12", 9"x6", 6.7"x6" and 4.5"x7". These are also odor resistant as well as waterproof but are not quite as rigid as the other two. The other bags may be odor resistant as well but aren't marketed as such.
The OmniSeal pouches are available from REI and, I think, from Campmor - and I think you can get them directly from OmniSeal, and they are out of Seattle. They make the exact size pouch, but sometimes you can find a pouch an inch wider and taller than that one, don't see a maker on the ones I have; I'd like a little larger pouch sometimes.
Has anyone written AMK and asked if you can buy a couple of them empty? Particularly if you buying a PSP direct from them and some other gear. They are a small enough outfit that if they still remember customer service.
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