I agree with San Miguel. When I was expecting my first order of banknotes to arrive, I went out to a few places to look for an album to store them in. I also looked online as well. i didnt see anything that I liked, because I wanted something more economical and something where i could see both sides of the banknote without handling it.
I found the perfect things at work (at an office supply store). I bought a regular 3 ring binder, and I also bought 2 types of sheet protectors. One style of sheet protectors is just a regular archival safe sheet protector, and the other style is the same thing, only made to fit 2 4x6 photos in it.
Most of my banknote fit into the 4x6 photo pages, and the larger ones, like ones from Iraq and Yugoslavia will fit into the full size sheet protectors.
KFC