Newegg offers the Rosewill 4-Port USB 3.0 Hub in Gray, model no. RHB-341, for $12.99. Coupon code "AFEX15D55Z" cuts it to $11.69. With free shipping, that's $18 off list and the lowest total price we could find. It features separate power switches for each hub and a transfer rate of up to 5 Gbps. Deal ends May 8.