How come this shirt costs $35 when there is a $10 Dollar sale going on? Im so confused someone explain. Quick.

Its crazy how much i have to check up on this webside i do. its like i ask for some reprints then i stay away from the website for like a moment and the next thing i notice is that the shirts i want have already come and gone with sonic speed. can anyone relate? there is so many sold out shirts i want!! *cry*