Recently bought 33 and 55 teeth gears from taobao at China.

https://item.taobao.com/item.htm?spm...cket=15#detail

https://item.taobao.com/item.htm?spm...cket=15#detail

Prices are for Chinese market. The same can be found at aliexpress but prices are much higher.

Best regards
LMMasterMariner