I got mine from dealextreme as well. It is reliable site but long shipping time probably due to locate in HK.
What flash card is recommended? I am assuming there are kits since the SD card has to go inside the Flash card.
Generally the M3 or the CycloDS are the most recommended. And you can get them as combos with a microSD or without and use any microSD you have laying around. And the flashcarts have a slot that the microSD pops in and out of. Its not a technical process or anything.