From the product page on Amazon.com:
Price: $17.99 Free Shipping for Prime Members
See also my review of the iClever 6-port USB Travel Charger. This iClever USB charger is identical except that it has 4 ports instead of 6 and is lower cost.
I have been using the 6 port version now for several months and I am extremely happy with it. With all the devices I need to keep charged, it has been great being able to do with just one item plugged into the wall.
It is also very nice being able to charge any of my USB devices from one source regardless of individual current limits. I can have my Bluetooth headset, smartphone, tablet, and external battery all charging at once.