On mine the G3 is not available from anyone, and the G4 is $150ish. Haha. Will check eBay as well...
eBay has the G3 without the battery or charger for $59, and the G4 is around $125. Hoping to catch a fully functional G3 at around $70, and fully functional G4 at $100. The waiting game begins. On the subject of waiting, my PowerMac G5 is on the way right now!