eBay is expanding its lesser-known eBay Sell For Me service to mobile with the launch of a new app called eBay Valet, which promises to let eBay do the selling for you. That is, it takes every step of the selling process — from determining an item’s value to listing it online to shipping it when sold – and handles it for you. Like its web-based counterpart, eBay Valet is designed to make online selling easier and more approachable, not only for first-time buyers, but for anyone who doesn’t have time to handle a listing for themselves. (It’s sort of like the digital counterpart to those stores that would “sell it on eBay” for you, which you might remember from the movie “The 40-Year-Old Virgin!”) To some extent, eBay’s Sell For Me service is its own take on the various online consignment shops that have sprung up lately, like Poshmark, The Real Real, ThredUp, Threadflip, Twice and others.