I think only redwolfairsoft.com has the glock 22 slides/barrel. It's one of their custom items. Not bad, $130 shipped. I like the slide, it makes my glock stick out from everyone else's.
As for installation, it would fit, but wouldn't rack smoothly. I tried fitting it myself, but gave up after a couple hours and brought it over to my local airsoft shop. They did a good job, now it racks up smoothly. Also I had to replace the recoil spring, for which I used a KSC USPc stock spring. Just had to stretch it out a bit and now the slide doesn't get stuck at all.