Gray Market (Long War)

For the most part, the Grey Market is mostly unchanged, save for that you can now sell Meld. And, for the same reasons as Elerium: you might not want to do so. Additionally, Council requests for corpses are much more worthwhile, and there are plenty of other ways to make money in Long War, so don't go dumping their bullet-riddled bodies into the Market just yet.

Most items XCOM manufactures can be sold on the Gray Market, though not at a profit, unlike the 1994 game.