I currently have 60 -70 items on ebay. My shipping for 10 cards is $1.50, 20 cards $2.00 and 30 cards $2.50. I do ship overseas 10 cards $2.50.
Check out the link below and you can also veiw all my ebay auctions and you'll also notice I start my auctions at .99 cents and let the bidding market deside a fair price.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=350045919139&ssPageName=STRK:MESE:IT&ih=022