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Start by searching on auction sites, such as eBay, to see what the product or similar products in your category are selling for. For example, try to find the price range for your particular brand of electronic headphones as well as the larger price range for headphones in general. If you can find the price for your particular brand of headphones, take note of both the highest and the lowest price listed for the item. With this knowledge of the price range, you can start thinking about how much you will ask for your item.  If your item is in better condition or has something different from the others on the list, you may be able to price it in the higher price range. If the item is pretty much the same as the other items listed, you may want to set it at an average price. Looking through the online listings for your item on the auction site, such as eBay, you should see how much people have actually paid for the item. Taking this price into consideration, think about how much you could sell your particular item for.  If you are using eBay, scroll down to the ‘show only’ options on the left side of the page, towards the bottom of the listings page. Click on ‘sold listings’ and then review the items in your category (e.g., headphones) that have sold. Reviewing the prices of sold items, determine what you think you could sell your dollar store item for online. If you cannot find your item on eBay or other auction sites, try searching for similar items. For example, if you found a particular brand of faux wood headphones at your local dollar store but cannot find the same brand on eBay, see if there is a similar pair of faux wood headphones. Taking into consideration the current price range for your product category (e.g., headphones) and the prices that your particular item has sold for, set a price for your item.  Price your items competitively. Taking into consideration both how much you paid for the item at the dollar store and the current price range for the item on eBay, try to set a competitive price that will get the item sold quickly and efficiently.  If you are using eBay, you can set a reserve price which is the lowest that you would be willing to sell your item for online.  On eBay, you can use a fixed price which means that there will not be any bidding on your item. It will be sold, or not, at the fixed price you set.
Inquire into the price range for your product category. See how much your item usually sells for. Set a price for your dollar store items.