http://www.yesasia.com/?/cgi-bin/div-cn/ds-m3sd2
This is the company I went through. They also have a US branch, but they don't have the same package deal (with the Passkey 3) and with shipping, it cost me about the same to get it from China as to get it from the US (and I happen to live in America). O_o Really weird.
As for flashing, that won't change the access times for games, though it will drain a little less on the battery (not enough that you'd likely notice) and it's all around more convenient. I think your card should be fine, and it's listed as "working" on the M3 wiki (found here: http://www.m3wiki.com/index.php?titl...Card#SD_Cards).
I also was horrified by the pictures I saw of the massive thing sticking out of the GBA slot. o_O I don't know WHY they show those images, because it makes me not want an M3. If it's the one that extends vertically out of the GBA slot, that's just a programmer for the Passkey 2 (a previous model), so you won't even be using it, nor do you even use it much if you actually did have it. So.. don't worry about that.
That's about all I have off the top of my head. Divineo's a good company, I've done business with them several times. Not sure if that's the best price online, but it's pretty good.
If you have any more questions, post them here or PM me.
Bookmarks