Where can I find a replacement part for a seatpost collar? I have a foldable bike and I need to constantly adjust the height of my bike seat, the problem is that one of the pieces of the seatpost collar is totally worn out and needs replacement.

The part that I need is depicted in this image:
http://imgur.com/NZ97PME

Ideally I wouldn't want to spend too much money on this. Does anyone have a creative solution to this?
Through a lot of searching, I can't say there's anywhere that sells that specific part; however, you may have some luck contacting the manufacturer or distributor directly.

But, a much easier and simpler solution would be to replace the clamp/collar entirely. It's probably pretty worn out if you're missing that piece anyway!

Check out the great selection over at Jenson USA, or your favorite LBS.