There's a guy on Ebay selling AmiVGAs for £10. I brought one just for the hell of it.
Note though, this unit requires a boot disk before you can use a VGA monitor and only supports a fixed 640*480 screen mode.
Also because the unit was developed in 1993 it does not work with all newer monitors. I tested this unit on 4 monitors and only the 3 'vintages VGA' work not my SVGA.
ALSO requires the Super Denise Chip.
Skip