KDX220R: best source for cylinder?

[billie_morini]

Can anyone suggest best way(s) to obtain cylinder for KDX 220? I have a stock rebuild underway. In parallel, I'd like to obtain a second cylinder for Fredette porting. This way, it is possible to experience stock performance and Fredette-enhanced performance for the sake of comparison. It also provides backup supplies in case cylinder replacement is necessary. It's okay if the cylinder is used and requires re-plating. I possess engineering and science education & experience and like to make my own direct comparisons. Additionally, based on my geographic location, it's beneficial to have backup equipment & supplies on-hand.

[KDXGarage]

Usually, eBay and wait for a cheap one that has not been sleeved.