Hi melissa..Sellers are not allowed to request more than stated in the shipping section of a listing. Here is practice policy and you could forward to seller referring to the terms and conditions section..
http://pages.ebay.ca/help/policies/selling-practices.html
Can decline and nicely but firmly ask seller to ship your purchase. Should seller refuse and refund , leave appropriate feedback and low DSRs.
Do not accept a mutual cancellation if seller files one.