[quote name='henwy']So which of these games do you think will eventually go lower and which will stick? I'm sick of buying games I know I won't get aroudn to playing for ages and then seeing it for lower while mine is still shrinkwrapped.[/QUOTE]
Well, take the example of other "new" Zelda games, in particular the portable systems' games i.e. Minish Cap, Oracle of Seasons/Ages, and the other DS Zelda game, Phantom Hourglass. Link to the Past was a repro, and of course many of the console Zelda games have been discounted here and there, greatest hits etc., but Zelda games tend to hold up very well and retain a good chunk of value.
From what I recall, rarely have (or were) any of these been discounted, most I believe were not reprinted and they all seemed to retain their value.
As for Mario and Luigi, just look at the first DS Mario and Luigi. Very hard to find, I don't think I ever saw it discounted, used copies still very expensive at Gamestop.
I say for $25 flat, both are worth picking up. I could see them going to $20 in the future with a remote possibility of $15-20, but they could just as easily sell out everywhere, never get reprinted, and command a premium in the future.