When it comes to garage sales, one person's trash is...still another person's trash.

Garage sales are a popular way to clean the house of unwanted items. However, because most items are used, they have to sell for incredibly cheap.

Lynda Hammond, the Garage Sale Gal, is a secondhand expert, selling and buying items all across the country.

"Almost anything and everything will sell at a garage sale," she tells Mashable. No matter how farfetched the item, there is someone who might be willing to scoop it up. However, that might mean charging only $1 or 10 measly cents.

Hammond resides in Phoenix, Arizona (which she dubs the "garage sale capital of the world"). Ten years ago, she lost her job as a news anchor and moved there with her husband. They began to frequent garage sales and resell the items on eBay. It became so profitable they were able to make house payments for three months straight. A garage sale obsession was born.

Hammond bought this McKenzie-Childs cake plate for $5 at a garage sale, then sold it for $200 on eBay. Image: Lynda Hammond

Each sale is different, because you never know what people will actually buy. For example, Hammond says she would personally not sell or buy a mattress from a garage sale, but it's usually one of the first items customers snatch up.

Though Hammond says you never know what will sell, there are a few things you can't expect to get much for. We rounded up seven items likely to be worthless at a garage sale.