I've only found the gears on eBay so far, and I think it was either $20 each or $20 for the pair. I didn't even try to shop around though, because I really don't like the idea of putting plastic back in there. It's just going to fail again up the road and be right back where it is now. I wish I could get metal gears. I'm sure they'd cost more, but at least they'd last and I'd feel like the fix was worth it. New plastic just feels temporary and like I'm building in a weak link.
I might just do it anyway, I guess. I've never replaced gears or re-timed a machine, I suppose it'd be good practice if nothing else. Any idea what the expected life span for a modern plastic gear is?