I picked up one from a local Walmart. Generic cheap 2 ring binder.
And as for the manual size, there are different sized pages available. If the size difference is minimal, then they will likely fit in 5x7 pages like these.
I did this too with these 5x7 pages! I used this 5in binder to store them all as well, but I think a 6in binder would have been a better idea because the 5in is almost full now with all the expansions. I got the binder from amazon warehouse deals for ~$4 too!
I think someone said that they used clear bases like these to rebase the minis on. Remember to take out the cardboard inserts if you glue the figures to the big black bases that the game comes with!
I havn't figured out a cheap way to store the minis yet though.