Get your taxes done using TurboTax

Since you are already using TurboTax Home and Business, I recommend you report the 1099-K as "business income" (Schedule C), and show the cost of of the personal items you sold as an expense (do not use Cost of Good Sold interview).

Use the Other Common Business Expenses interview and add "Cost of Items Sold" as a Miscellaneous Expense equal to what you were paid by eBay. You don't want to show a business loss or a business profit, just report your 1099-K receipts.