There are several contenders in the used-electronics auction site space. Most people are familiar with eBay and Amazon. You could list your products there but you may have better luck at a specialty shop such as Glyde. The site works out well for both buyers and sellers but more so for sellers….
https://bestwebapps.net/2017/08/12/sell-your-old-tablets-and-phones-at-glyde/ BestWebApps® https://bestwebapps.net/