wanted to give out a heads up that at the end of every summer armor normally fall quite a bit in price. This is due to people going back to school and selling off their bank as to not lose gp while they are inactive. In order to prove this point, I added some graphs that show this. The ideal time to re-buy is the first week of September.
if you click the 1 yr graph you can see a fall in every item. If you sell sometime this week/next week and rebuy in a week or two you can make a nice amount of gp (likely).