Hi,
As hamtronix said: eBay. I have bought a few from there, but be prepard to pay (80-100 quid +). Also try amibench
www.amibench.orgI got a Micronik SD (no FF) internal from an ad on there. The plain SD's can sometimes be a lot cheaper. With Hires No Flicker mode (dblPal driver I think) WB looks great. Load games via WHDLoad and you are all set.
I currently have this setup with a 4GB SD card and an 030 which makes for a sweet gaming machine.
HTH
-(e)