I recently received an internship offer from ESI. I had to turn it down because it conflicts with a required summer IPPE. I was offered $23/hr.
The large academic hospital that I work at as a tech offers $14/hr for their summer internship.
The VALOR Program usually pays between $18/hr and $21/hr dependent on site.
The AMCP/Pfizer MC Internship program offers a $6,000 stipend for the summer. Additionally they provide transportation, housing, and registration for a conference.
Last summer I applied for and accepted a research opportunity at my university. The funding was provided through an NIH Training Grant. It paid $5,600 for the entire summer program.
Perhaps others can chime in on industry, retail, and other areas?