Gray Market (Long War)
Except for different prices, the Gray Market is mostly unchanged, save for that you can now sell Meld (4 credits per piece) and most manufactured equipment for 40% of its manufacturing credit cost. Exalt loot is worth 200 credits per piece. You cannot sell Satellites, Interceptors, and Firestorms.
For the same reasons as Elerium: you might not want to sell Meld. 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.