Hi Paula - I have not seen anyone post a market for phone stores specifically but I know these guys specialize in small businesses (chains) and could definitely try to help with this one.
Most companies have a contact name with email / phone listed under the 'ask a question field' on these pages but you can always find a phone number either on this page or their company profile page.
Small Business Unit
Small Business Package - Bop
Small Business Insurance
Small Business Packages & BOP's
Good luck!
Paula