ok here's how it works:
first you need to on your own find the appropriate donor carts (a list of what donor cart will work for each game see
nesreproductions.com). for final fantasy II i picked up ultima: exodus for a couple bucks off ebay (zelda I works too - i thought about getting FFII in a gold cart but decided that would be blasphemous
). FFIII was a pain, as it requires a special pressing of super mario brothers 2 that isn't missing the 6 pin connectors under the cart. i spammed questions to ebay sellers and finally found one.
then you just send them to this dude in canada (after of course dropping him an email) and about a month later they show up on your door step.
pricing is fairly reasonable - $25 per game. FFIII was $35 however, i'm assuming because the guy had to hook up a battery for saving.
i dunno - i was skeptical at first, it seamed too good to be true. but alas, it is true - and now i get to hear that FFII town theme in all it's 8-bit glory every time i need to stock up on potions
.