GBA Flash Card Advice

Archived from groups: alt.games.video.nintendo.gameboy.advance (More info?)

I recently inherited a GBA-SP and have been comparing flash cards.
I'm trying to decide between two of them, not that either of them seem
to be in stock anywhere right now, and wanted to get some feedback on
them.

I'm looking at either the 512mbit X-ROM or the 256mbit XG2Turbo...
Beyond the X-ROM having twice the capacity, the XG2Turbo having a user
replacable battery, and the X-ROM being $10 more than the XG2Turbo, is
one any better than the other?

I'm planning to use it to more easily take a handful of games with me
if I'm stuck waiting someplace. (dentist, doctor, auto repair, etc)

Comments, suggestions, good places to buy from in the States?

Cordata