Reddy Rents is easy to find on Hiawatha Avenue. The front desk is well staffed and will help you find just about every piece of rental equipment you could possibly need for almost any DYI project.
They also sell concrete at very reasonable prices-and will provide a little cart that holds about a yard of concrete to trailer on the back of your pickup. (Note: may not be the most efficient method for larger jobs).
Or, if it's concrete you want to get rid of (say you just really messed up your DYI concrete project for instance)-Reddy Rents provides jackhammer rental as well.