Hi Chris,
I thought I bought mine from the Dick Blick store, but I just checked their online store and I do not see them listed.
Here is a list from the Smithsonian Institute for
Conservation Suppliers:
http://www.si.edu/mci/english/learn_.../supplier.html
Also, use this link below - scroll down and find "Paper-Based Materials" on the right side of the screen - under that heading you will find a link "PDF" called
◾Caring for Paper Artifacts (Espaņol )
It is a very informative read
http://www.si.edu/mci/english/learn_...are/index.html
I have used & use "archival" quality sleeves... But I am moving away from them. From my experience though, I have several issues with them. 1st is the issue of getting the document into the sleeve, especially if its a fragile document. In turn getting it out of the sleeve can be tricky and in my opinion the "sliding in and out" increases your odds damaging the document. 2nd is that static electricity is often an issue with the sleeves and I have read that can cause deterioration. 3rd, if you are in a location that has allot of humidity fluctuations, these sleeves can capture & retain moisture.
Helpful Hint:
If you do decide to go with the Sleeves in stead of folders here is a helpful hint that will help you slide the document into the sleeve:
Sandwich the document between two pieces of paper - then slide all three in at once - then slide the top sheet out - flip over the sleeve and slide the other sheet out. This helps you slide it in and also keeps you from handling the piece you are trying to protect.