eBay

I crammed most of my issue into the title - I'm in Canada and have my ebay account as a Canadian. I'm trying to get around the ridiculous shipping fees to Canada by having items shipped to an american address near the border - which I have configured...

For some reason despite having a shipping policy that includes a combined shipping discount, none of my buyers have that applied if they pay before I send an invoice...so what I do is I (through paypal) refund them the difference. My question is, doe...