Quote Originally Posted by CapnCrunch53 View Post
Yeah, I don't think they were very popular, for pretty obvious reasons. That said, I'd love to get my hands on one cheap if I could find one, just for the sake of having some of those oldschool NES games on the GBA.

Not sure how long they supported it, but I remember most of the GBA games I got new would have ads for it in them IIRC, so I think its something that was around for awhile, but just wasn't very successful.
That would be because the Gameboy Advance SP was released not too much after the e-Reader. The cartridge port was moved in relation to the link port making the e-Reader impossible to use on an SP. The lit screen sealed the deal on the SP, leaving the original GBA (and subsequently the e-Reader) in the sands of time.