REcently bought the Sandisk Ultra II 256MB card, along with a Dane-Elec USB 2 reader, all for less than $100 after the rebate from J&R.

The card is fast and reliable, the reader works well - even on my USB 1 TiBook - though the reader does appear to draw more power than most ports will put out. As such, I connected it to my powered USB hub and everything works well - even under Panther.