As long as we're talking about LD rates, at my condo I used to have GE Residential Long Distance. 5.9¢ per minute with no montly fee or usage minimum. It used to be only available to GE employees, but now anyone can sign up. The only slight catch is that your bill is automatically charged to your credit card.

In my case, they were reselling me Sprint LD service, so the quality should not be in question. I guess GE just buys a ton of time from LD carriers and then resells it.