Percy spent his time between looking at the wands and looking outside. The people were a lot more interesting when he was inside a shop and didn't have to rub against them in those small spaces. However, no amount of observation could distract him from the fact that Cass was getting frustrated. He breathed easier when Cass finally found the right wand.
"I don't mind waiting," he answered when the shop owner left them alone, "and the price doesn't matter. You need a wand, end of story. Now, you can start doing magic again."