I saw this on another site, but it would probably work better on a local board like this.
A lot of us probably have some cogs and chainrings laying around unused. Anyone up for trading if they need a different size?
I have: 1 14T Surly 3/32" ~150 - 200 miles. 1 16T IRO 3/32" with a lot of miles. The teeth aren't completely shot, but I wouldn't use it on anything beyond a polo bike. 1 16T Surly 1/8" ~400 miles. Still in nice shape.