I try to combine shipping when I can so if you win/buy multiple items from me please wait till I send you an invoice so I can discount shipping if it applies to your items. Sellers are charged a percentage of the total invoice including the item cost and shipping charges. So refunds are complicated
I only accept paypal. I ship quick so the sooner you pay that much quicker I can ship. I also open unpaid item cases for those that love to shop but hate to pay. I do this to supplement my income and will not wait for those that do not pay - so as soon as I can open a case I will. That may sound harsh but if you haven't sold on eBay you have no idea what people try and pull.