Where is the best place to buy OKO red dots?

Don't tell me that they aren't as tough as Aimpoints, as I know that already.

The Aimpoint is for my "serious" AR. The OKO is going on a carbine I am building for my girlfriend to shoot at the range. I want one she will enjoy shooting, so I am keeping it as light and compact as possible. The OKO's open design makes it very easy to use and it only weighs about 4-5 oz, so it would be perfect for the intended application.

I know CavArms isn't carrying them anymore. Who is?

Brownells and Dillon both carry OKO, or you can go direct to the importer www.okousa.com.  Not sure if any ARF industry partners carry the line or not, but used OKOs do pop up from time to time on the EE; that's how I scored both of mine.

Adrinaline arms carries them, they are in the EE