That'd be a great place to go to get something. There are many binders and sleeves out there, and some are more spendy than others. The main thing to keep in mind is that you should make certain that the banknote holder sleeves/pages are Archival, and will not degrade the note over time. The PVC and other plastic ones are not good for long term storage of the notes. They will become brittle - or at least that's what I've read about them. Also, you may wish to make sure that the pages you are buying are going to fit all your notes. I have some that are small and some that are very large, so I actually have different sleeves for them.
Personally I have 1-inch binders with Ultra-Pro pages for the notes. This keeps my cost way down, allows for easy storage and lets my collection expand easily. The cost for Ultra Pro is much less if you order from their site directly - I've recently got 100 pages of 3 sleeves for 30.00. The going price I've seen others sell them online for is about 70.00 for 100 pages. Some resellers will piece them out if you don't need that many.
The Ultrapro site for the three pages is:
http://www.ultra-pro.com/page.php?pname=gaming/pages#