A great way to get the sellers to come down in price say to a dollar or less is have your cute little daughter smile and barging with them,works every time ,lol.
Sporting goods especially kids equipment sell good on ebay.Look for kids ball gloves soccer equipment ,ice hockey equipment all are very good to sell on ebay auctions.Make sure whatever you buy is in good condition and not torn up.
If you can get the sports stuff under 5.00 which is not hard,you are good to go.
Other really good items to look for are older gameing systems like Nintendo,Playstation etc.Make sure they work and have all the tv cables and hook ups.I have bought them for 2 to 3 dollars and have had them bid up to 20 to 30 dollars.
 

  A friend of mine sells coupons for dispoable diapers and formula that she gets in the mail and gets all kinds of bids.
Place your items on ebay at .99 cents and use parcel post for shipping I usually put shipping in the 5  dollar range which is fair.Shirts can be shipped in a large yellow envolope in the 3.00 range use the large envolope instead of a box and it can be mailed as an oversize envolope  which is cheaper.