For anyone having money problems, here is a friendcard I found at game faqs that has a hardwood katana equipped.
http://www.mediafire.com/?7g6046pu4ddy4rs
Basically, the hardwood katana sometimes come on level 100 sephiroths and I think Gabranths, it is nearly 100% drop rate item part of the super rocket set. If you equip yourself with a super ribbon, mog amulet, and thief glove then it's like +70%.. Making it pretty much a sure 100% drop rate every time you fight the ghost card. You can use Lightning, Yuna, Shantotto.. and I forget who else can naturally equip the Super Ribbon. But yeah, just keep fighting that friend card and it'll either drop the hardwood katana or the artifact(which sells for double lol). To quickly sell the artifact you can just go to artifacts and I think hit triangle on them to keep selling them... which is like 180k a pop. This is the fastest way I found for farming gil.