www.car-part.com Stay away from JFE Engines, aka 22R/22RE.biz. That dude is a jerk.

I keep an eye on craigslist too for cores.

Ummmm... another couple places I internet shop with is www.spaldings.com in Spokane and BeepBeep! Automotive imports down in Tucson. Google for website; not sure if they have one.