Ok, so this might sound nerdy for most but idk :P
Since yesterday Blizzard started to sell the Celestial steed Wich costs 20 Euro's.
People in-game are very interested in this mount since not every got the money or the payment option to buy it. So therefor you can sell the item code in-game for like 20k gold.
Now for all the gold sellers out there: thats way cheaper then you could buy gold from the gold sellers!
20 Euro = 20,000g± ingame!
They also started to sell Lil' XT but i wouldnt recommand selling this one since most people hate to hear his voice... and he kinda talks alot, mainly to himself :P