Wow, 200 pages?! So 100 sheets, front and back?
I've never seen an album that would hold that much. Are you sure you want that? It would be REALLY heavy!!
I use the Hiller/ We R Memory Keepers 3-ring albums. It's about 2".
I just counted my full album, and I have 41 pages (82 layouts front-back). It may be possible to squeeze 50 pages, but no way 100.
I know you can buy binders at least up to 5" wide at office supply stores, but I doubt you'd find a 12x12 size.