I was given some anti-static 12"x15.5" bubble bags. They have work great for 8x10. No zip on them but they are tall enough just to fold over. Each holds 2 to 3 holders. After 5 years years, they are worn out and I need to replace them. Because there is not zip, they may not be perfect under very dusty conditions, But I have had good service from them
I like the little extra padding the bubbles have given the holders. Looks like with shipping they would cost about 50 cents each for 200 of them.
They have 10"x15.5" anti-static bubble bags that should hold one 8x10 holder for a few cents less each for 250 of them.
There is a 4mil, double-track zip, anti-static (non-bubble) 12"x15" for about 30 cents each for 500 of them. (No 10" wide bags that are tall enough in this style.)
Any of the above would be useful to me. I also have considered buying a case and then selling the extra here. I suspect most people would want the zippered bags.