I actually bought this counter ring in blue a few years ago, to count pomodoros (I really enjoy tactile things, so just moving the ring forward was a nice reward for completing another pom): http://www.critsuccess.com/index.php/lcr-counter-ring.html
It had a nice clicking counter action, was pretty comfortable, and didn’t show any wear after about a year of daily use. It seems like it would be perfect for your purpose!
(and jhoger, that page of tally counters is glorious!)