FFF
What you say is totally true, I would recommend them too.
I am pretty sure they are the cheapest in the Phoenix Area, and by some margin. If they are not, then it's close. The extra $100 they give you if you pay them $1000 by cash/cheque should be taken advantage of.
I'm not sure how they manage it. Most of the other places have raised their rates by $10-$20 per hour over the past year or so, apparently insurance costs have rocketed. I have
heard that Sunbird, which is on the same field, have stopped renting altogether after a couple of claims made insurance prohibitive.
One of the more annoying aspects of Chandler Air is their currency requirements. If you have not flown with them for 60 days you need to go up with an instructor. If you have not logged 3 hours in their supercub within the previous 21 days you need an hour of dual (negotiable). This is actually a good thing IMO, as they constantly are keeping your skill levels up, and they do not let you get sloppy at all. I am sure this has an effect on their insurance claim rates. Also they do their own work, so if you bend a supercub they just charge you the $2000 deductable and fix it themselves. It never sees the insurance company, so rates do not rise.
To the original poster, if you do rent from Chandler Air I would book time with an instructor well before you arrive. The instructors are incredibly busy - they are damned good - and last time I was there I had to wait 10 days to get re-checked out in a supercub!!!!!
You can get cheaper rates than Chandler Air elsewhere in the US, but not by much. The best rates I have seen in the more
developed 
parts of America are at Gibbs at Montgomery field in San Diego. That place is ridiculously cheap. California has a lot of flying clubs whichyou join for $5 per month or so. That way you don't pay sales tax either, which saves 8%, so you can definitely get deals in SOCAL which you might not expect.
Cheers