finding/buying FF7 is not very hard, you will find multiple copies of it on sale at ebay, though depending on what type of it you want it may end up costing as much as a new game would(50-60$). As well it can be gotten as a stand alone game for PC which has recently(past few years) been re released with added in game achievments(nothing to brag about here, seriously). As well it can be purchased/dl'ed for the PSP. That being said i prefer the PS1 version best and it can be easily found all over as an iso.
Anyway as far as RPG's go its definitely my second favorite, and well well worth a play through or 5. One of these days ill sit down and do a full complete of it(all items to 99 that you can get to 99, all master materia/sidequests done, all characters unlocked and lvl 99...etc.) it will take a bit of time but should be good fun to distract me from time to time on the side over a period of years.