We’ve been a fan of Lensrentals.com for awhile now. They have great prices and the equipment is always excellent. They are out of Memphis so we can usually get things next day delivered here in Nashville. They have opened a location in Nashville now and it is just fantastic! We did our first pickup the other day for a camera body and the total process was less than 10 minutes. We had made the reservation online, walked in and told them the name on the account and moments later they handed us the bag. There was no confusion, no insurance questions or issues, it was just a very pleasant and efficient experience.
Pro Tip: If you live in Nashville, this should be the only place you are renting lenses and cameras from. They are cheaper and way more organized than your other options. If you are in the US, you can still take advantage of their awesomeness by ordering your rental online.