Amazon has a San Disk 16GB MicroSDHC for < $30... but....

[kirstein]

Remember that class ratings are minimum speeds. For some reason Sandisk has always been very conservative in their ratings. I've read reviews that will show Sandisk class 2 cards outperforming other brands class 4 cards. That said, I have AData class 6 cards and am happy with them.

[n8mack33]

I got a class 16GB Class 2 on Ebay a couple months ago. Says its from Japan. From looking at other sites and what not I believed it was made by Toshiba. Not sure if it is or not but it seems to work good. I was having issues with Coreplayer choppiness when I first got the card but I realized that was because of a memory leak and when I disabled Sense high res video in Coreplayer is flawless (my 8GB Class 6 crapped out before I got my TP2 so I had no way to compare). I don't think it is worth the extra money for a Class 4 or 6 but maybe for Sandisk brand (although looking through the threads there are a lot of people who complain about Sandisks going bad).