I don't really see the point in re-issuing Oracle of Ages, Oracle of Seasons or Link's Awakening DX, I mean, sure, they were for the Game Boy Color and not the Game Boy Advance, but they play fine on the Advance and they're not exactly rare. Amazon.com sells all of them, either themselves, or has users selling copies.

Personally, I think Nintendo have done great with the Zelda series. These re-issues of the older games is brilliant. I have the Game Boy Player on my Gamecube, so I can now play every single Zelda game on the one console. The first two from the Bonus disc, A Link to the Past, Link's Awakening, Oracle of Seasons, Oracle of Ages and Four Swords from the Game Boy Player, the Nintendo 64 games from the Bonus Disc, and The Wind Waker. It sure beats having to set up an old jittery buggy freezes-every-two-minutes console to play them.