I couldn't find anything on this, though it is basically buy low, sell high but it is on a way bigger scale. Large Prismatics usually go for about 25 gold on my server and while I was sleeping, I made almost 400g. I spam in trade chat "BUYING ALL LARGE PRISMATICS SHARDS 15G A PIECE. BUYING IN BULK PST". People will be like..pfft you will never sell any for that price, they are wrong. People do not want to wait to sell their stuff on the AH and especially if they have them in bulk. Some girl sold me almost 50 for 15g a piece one morning. So once you get all your prismatics, put them in the AH for about 1g lower than the lowest (and preferably wait till price is kinda high) and there you go, super easy money when you wake up to go to school or from your parents basement.