Highly variable depending on region, practice setting, experience, and school year.
Personally ive gotten $15 at my hospital and nuke jobs.
As far as what I've heard , so to speak, from friends and contacts, id think you could expect $12-20 for retail and $14-25 for hospital depending on the previously listed factors.
Yes I know a couple hospital guys making in the mid 20s but they are expected to work 15-20 hrs / week including nights. Average # for retail I hear thrown around is about $13 ish , but usually with a much more easy and flexible schedule
Hth . And BTW , don't expect to negotiate intern salaries, they are fixed for the most part unless you are bringing something really special to the table