Component GC cables are very hard to find, cheap at GS (five bucks or so I think), but they sell for 50ish on ebay so alot of times workers grab them and sell them. I got lucky that the ones I found were mismarked as a power adapter and in a nondescript bag hanging on the accessories rack. Also, check the back for two video outs, I think they're marked analog and digital, but I think a launch model should have digital video out as it was a feature that was later cut rather than added later in the GC lifecycle.
The rumor on gameboy player proliferation was that some smaller company that GS bought out had a ton of these for some odd reason having more hit the market devalued it. That's what was discussed here when it first got cheap ($30 at GS).
I remember passing on it new at a Target clearance price of 30ish five years back cause I figured I'd find it cheap on ebay or something. I got around to checking ebay about a week later and crapped myself when brand new ones were selling for 120. Of course when I went back to target it was gone.
The GBA games I've tried on my plasma and my lcd through component cables look good. Blackthorne, Double Dragon, Minish Cap all look good, but you have to know what to expect. I kinda felt like I was playing DD in the arcade again on a big screen, but not old gen graphics feel.