I assume eBay sent you a 1099-K. The IRS will also get a copy of the 1099-K.
Form 1099-K is not entered on a tax return, rather it is used as information by the Taxpayer.
How you report the "garage sale" depends on your intent.
If this is a one-time thing, or sporadic just to clean house without intent to make a profit, you could ignore the items you sold for less (you can't claim a loss on a sale of a personal item) and only claim the item you sold at a profit as a capital gain.
If you do this on a regular basis to make a profit and/or earn a living, you would use Schedule C and report the sales as a business venture. In this way you could claim all the sales, as well as other business expenses, therefore limiting the gain on that one item. You might be subject to Self-Employment tax and you would need to upgrade in order to use TurboTax. The IRS might even argue that you are not in business, but rather just enjoying a hobby. Additionally, you would technically be responsible for keeping business record.
In my opinion, the easiest avenue is to claim the gain on the one item and move on.
The gain for that one personal item would be entered under “Stocks, Mutual Funds, Bonds, Other”.
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