What are some alternatives?
When comparing SidelineSwap and Amazon, you can also consider the following products
eBay - Buy and sell electronics, cars, fashion apparel, collectibles, sporting goods, digital cameras, baby items, coupons, and everything else on eBay, the world's online marketplace
craigslist - craigslist provides local classifieds and forums for jobs, housing, for sale, services, local community, and events
Etsy - Buy and sell handmade or vintage items, art and supplies on Etsy, the worlds most vibrant handmade...
Letgo - Buy and sell used stuff on the letgo marketplace: everything from electronics, cars and collectibles to housing, clothing and furniture.
Needora - Get what you need, sell what you don't.
Facebook Marketplace - Marketplace is a convenient destination on Facebook to discover, buy and sell items with people in your community.