I've got a 30t one and probably 36t one. If i was looking for one i'd look on ebay or aliexpress for a cheap chinese one. I'm using a cheapo chinese one on my cotic and had no problems with it after 1200 miles. It cost buttons especially from aliexpress as first time buyers get discount coupons.
The one i bought from ebay was a j&l (actually from taiwan and that's still ok after 1200 miles. The really cheap ones, might be made of cheese. I've bought a cheapie fron aliexpress for my new bike (if it ever arrives (tip don't order an orbea) so i can't say how that will wear, but it was so cheap it's practically disposable anyway.
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