http://www.games-advance.com/ seems to have both. Don't know much about the website, but they claim that their games are "new" but are tested and don't come sealed with the original packaging or anything. Worth a shot I guess.
A couple years ago I was in the market for the original and wanted it brand new. I thought I found a great deal for like $20 (all others were well over $100), but it turns out it was a counterfeit cartridge. So I'd crack it open and check it out just in case if you do pull the trigger.