How much do you want for the PAL A500?
I know you said Monitor not needed.
If that means you have an RGB monitor already (1084s or ?), then great. PAL is awesome to have for game compatibility.
If you plan on using an A520 or something similar to get composite or s-video tho, it'll be tricky to find a TV in the US that supports PAL.
Good luck..
desiv
