1) Disney sells two verions of pin "books" or bags for use. In the standard version, they now use a neoprene style page that has about an 8 x 10 surface area for pins. Sealed at the edges, new pins are more difficult to secure in place. The pages are also more difficult to penetrate than the felt pages used in older books. Disney also sells a 3 ring binder style that has comes with 5 pages of "felt covered backer board", an 8 x 11 version of the original pin cards. Both styles come with plastic page seperaters to protect pins from scratching.
2) You can purchase "independent" pin binders from Olympic and Little league pin collector pages. While they do work, they tend to be less rugged than most of the Disney Offerings. Hard Rock Cafe also offers pin binders that are similiar to Disney pin binders. The Guitar shaped case while nice, does have a high amount of "negative / unusued" space.
3) You can make your own pages / binders by using a 5 inch D- ring or Catalog post style binder, heavy felt or craft foam pages, and multipage, page holders. You just cut the foam, or fold the felt to the appropriate size. Use a backer / stiffener for the foam - I recommend a good heavy duty card paper or just multiple pages of normal paper.
Finally, there are are the good old fashioned cork boards.