You ought to be able to use MMC or SD in that camera.
Theres a few el cheapo brands of MMC/SDs that are incompatible with some cameras, but rare,.
i'll add viking and lexar to sailors list.
I was looking for an MMC card for my ngage , they sold me an SD card at best buy, swearing it's compatible, it didn't even fit
i just went outside, tried and returned it. SD cards are a bit thicker, so if the slot is just over credit card thin about 1.4mm iirc , its probably better to go with MMC's
usually i buy from expansys
http://www.expansys.com/d_storage.asp
This might be an expensive card for your tastes but its about the biggest around, you'll probably rarely fill it
http://www.topram.com/mmc.htm
Strangely the camera manufacturer lists the largest useable size SD/MMC card as 'unknown' but has tested upto 128MBs
You'll also be able to use it as a portable drive !