Get the official Disney pin bags and if you can find them pre-2012, that's the best. They are a bit more pricey ($40-60) but they are better than the $20 black pin bags that people customize because those $20-30 pin bags are the ones that you have to put cork board, coraplast, or foam to hold your pins better in.
Also, check with PinPics. They are selling pin bags for $20 (+ s/h). I seem to recall a conversation with Lenny of PinPics where he said the bags were going to have the pages that are pre-2012 (so that when you poke pins through and then remove them to change where you want them displayed, you don't see the holes.
Unfortunately, PP doesn't have pictures of how the pin bags look inside.