Currency pages are too expensive, dry out over time, and become brittle, so I don't bother with them. Ultra-Pro (who primarily makes pages for baseball cards) makes a three-pocket page that works perfectly for most notes. They usually run $20 - $25 per hundred, and they will fit into any three ring binder.
They also make a 20 pocket page for photo slides, but they work perfectly for coins in 2x2's.
The plastic is archival quality, so why pay more?