Good Luck in your quest buddy.
As mentioned already thats pretty much the places to look.
You could check local Auction lists online also as these do pop up but a bit hit n miss due to not being able to test drive etc but maybe a bargain to be had!!
I know PH and Autotrader are probably the best places to find one but I've had luck with spotting a gem on forums before so I thought I would have a look. With any luck I'll find one with under 60K miles and maybe even an aftermarket (i.e. not drooping downwards) exhaust.