Average Hourly Rate for eCommerce WebMaster?

Hello,
I recently got hired for a job(multiple jobs) dealing with managing a few company’s websites. They all use ClickCartPro which is a CGI eCommerce shop script. It pretty much runs it self except for adding/editing items, seeting up accounts for special customers, and adding sales. I will also be creating new designs monthly (or every other month) in order to keep customers interested (Requested).

The people hiring are local businesses and their customers, but they do not know how much an hour this type of work usually is and neither do I.

Do any of you do work like this or know how much people usually get paid (per hour) ? I don’t want to rip them off but I don’t want to work dirt cheap.

Thanks,
Flash-matic