cornykeg.com clearance section has been my favorite source. It gets updated as they get stock of the "ugly" or "scratch & dent" kegs and might change throughout the day, so if it says out of stock now, just check back later and there might be a few.
They are beat up, but guaranteed to hold pressure and come with all new ball locks, o rings, and seals, so that is done, and depending what you get, still come in under $50 shipped. I just ordered 3 more last week - 126.84 to my door.
FWIW, I have been going with the converted pin lock because they are a bit cheaper and the dimensions don't make a difference on my setup - actually a little shorter is better for me. Downside to those is that they don't have the manual pressure release valve on the lid, but that hasn't been an issue at all for me. Just relieve pressure by pressing the gas post poppet.
Other than that, I really like the torpedos and they look like a great deal. I will be going that route for some smaller kegs when I get around to it.