I have a DS lite which i modded the case to and accidently scratched the top screen on, it has an m3 perfect mini sd and passcard and I have an mk1 gp2x that can overclock to 285mhz would come with (2) 2gb sd cards. Let me know if you're interested I can provide pics if needed.
I do remember seeing that as well, but it's like an ultra test version, very limited, I don't think you could fast forward or reverse through the files it would just play them. But it gets the job done.
Does your multi voltage power supply have removable ends? If it does did you put the positive and negative in the correct direvtion. As for why your batteries are not powering it, are the batteries loose in the machine at all? I can't really help out in terms of technical problems, but I have...
It may be because he's using the canadian ebay as that is where the item location is from, either way you can find it easily by searching on ebay for a gp2x, it's not like there is a great abundunce of them there :P
I'm looking to find a gp2x mk2 model, as long as it is in good condition, i'm not concerned if there aren't any extras with it. If you know anyone who is selling one, or who wants to, let me know as I would be very interested.