In my opinion one of the best rpg's ever made a must have if one likes old school rpg's a game that is worth it's full value especially since Prizes aren't to crazy in the US for this game, In pal country it is way worse for this game. Around 70 dollars ain't that bad , basicly a bit more than the price of a new game nothing to crazy.
I would recommend the gamecube version over the dreamcast version, more durable disc, extra content,less monster encounters and slightly better grapics. The dreamcast version has slightly better music, but to be fair the difference is minimal and does not outweigh the bad points of the dreamcast version.
You could wait for a very long time to get it for a deal or you could just buy it now instead of saving 20 dollars etc. finding a sought after game for a deal can be allot harder than finding it for free in my opinion, both ways can take a while.
Just as an example it took me 2,5 years to find this game in a deal, that's quite a long time, admittedly for free but still. Gamecube deals are pretty hard to find these days there is to much hype, a huge difference compared to some years ago.
Still though one of the few games that is truly worth it's full value, prizes aren't to crazy just yet for this game. It's a hell lot better than a brand new CE with a retail prize of almost 200$ for the newer consoles, that's what I'd like to call crazy.