My Desperation Bag of choice is to just request extra paper bags from Office Max (or Staples or Office Depot) when I'm there printing or buying other supplies. They usually give me extra bags when asked or will sell them for cheap.
But when it is not a time of desperation, I order clear sleeves here: http://stores.ebay.com/uniquepacking?_rdc=1
They've always been fast to ship.
I don't think these bags are archival, but of course, the definition of "archival" is lasting more than 70 years or something.
I have some of these bags that are more than 3 years old, and they're still fine, so whatever.
But when it is not a time of desperation, I order clear sleeves here: http://stores.ebay.com/uniquepacking?_rdc=1
They've always been fast to ship.
I don't think these bags are archival, but of course, the definition of "archival" is lasting more than 70 years or something.
I have some of these bags that are more than 3 years old, and they're still fine, so whatever.