Amazon has the RAVPower BOLT 30W/6A 4-Port USB Charging Station for $19.99. Use the promo code: OEAKHT78 to drop it down to only $15.99 at checkout. With the code, that’s $30 off the list price and the lowest we could find it for. The Bolt features 4 ports that are designed to charge iPads and other tablets (2 x 2.1A), iPhone and Android devices (2 x 1A), and has a total combined output of 6.2A. It has a compact, unibody design for added portability and it comes in black or white.