moorey
call me Mia
I always found surly ones to be the best value as they last but still around $30... Looks like they make a 15T ...
http://www.moruyabicycles.com.au/contents/en-uk/p5718_surly-single-speed-sprocket-15T.html
aw shit yeah. Thanks cock eye.These cogs are available in every increment from 13 to 22 teeth, so you can select that perfect gear