
When Jonah Seidenberg found out about Nike Minds, a futuristic-looking sneaker that claims to improve concentration by stimulating the soles of the feet, he had to have them. On a recent Saturday, the 12-year-old from the Chicago suburb of Northbrook and his mother searched StockX, an online sneaker marketplace, and other sites looking for a discount but struck out. “It was 10:30 at night and we finally threw in the towel,” said Lisa Seidenberg, a publicist.