AnkerDirect via Amazon offers Prime members the Anker USB 3.0 4-Port Hub, model no. AK-A7512041, for $13.99. Coupon code "A7512109" cuts it to $10.99. With free shipping, that's $25 off and the lowest total price we could find. (Non-members can spend over $35 for free shipping; otherwise, it adds around $8.) It's compatible with most USB-charged devices.