Actually, I found a brand new Xerox branded cartridge for the same printer (and some other brands) goes for $49 at Newegg FTW! (+$5 shipping.)
I'm willing to take a "chance" on that.
I scored it brand new--a $2000 printer for $500 on ebay ([after] actually, I think it was $400), so I figure I can "spoil" it with "real" cartridges, since I don't go through them very fast (had it since 2004, and it's my first refill, at 10,000 pages.) I decided to go with a business printer because I was repeatedly disappointed with consumer printers (plus, it's got the network card in it already and I got a cool duplexer for it for something like $75.)
I doubt I'll ever have to "service" it (something like 100k pages.)