When deciding what items to sell on ebay, a helpful tip is to sell items that are light and can be sent in flat rate envelopes.  With the price of USPS mail as high as it is, priority starts at $5.00 an item;  that can eat up ALL your profits, because people do not want to pay postage costs.  Send items less than 14 ounces in a first class envelope for USA, airmail for all other countries.