I say it will end at somewhere between 70 and 80 since there are not too many on eBay right now.
Yeah, I won't be surprised now days. After seeing that loose Super System card go for $200+ a few weeks back, anything is possible.
I bought my complete North American System 3.0 Card from eBay in an auction, within the last year for $70 - $80.
I don't monitor eBay regularly, but I've seen Bomberman '93 sell for $30 or less several times over the last couple years. I've even posted current Buy-It-Nows within that range in threads here when people have complained that they can't find it anywhere.