We have a customer using Loaded Commerce (Formerly CRE Loaded), and branch of osCommerce. Their website is heavily customized, and they have a list of things that they would like done, and are constantly making updates.
I would qualify this is an on-going part-time project. We have a lot of work queued up now, and they will continue to add things as time goes on.
You will be expected to track your hours, and we will pay by the hour.