Hmm... dang. There are a few stores around my area (OK/AR/MO/KS... chain stores that have shops in Tulsa) that might have it for cheaper, but then I don't know where you're located.
You could get it from Vimm's Lair (
http://www.vimm.net), but that's still $40. (Hey, it's better than $79.99.)
Other than that, I really don't know.
But, um, how did your CT mess up? Because a good cleaning can do wonders for old cartridges...
I just hope they make a classic Mega Man game for GCN. That would be so cool. I still gotta import Rockman&Forte for my GBA...