Update (1/23 11:46am): the discount code available in this post has now expired.
If you are an iMac user you like nice things. Reaching around to the back of your iMac every time you want to plug in a USB object is not nice. Sure there are options out there. You could drop $15 on a wrap around cord or buy a nice aluminum USB 3 hub (this nice Satechi 7 port is $40 or Powered Anker is $44 or many others have existed for awhile).
If you want something that looks like it came from Apple however, check out the iMacompanion. It is a single USB 3 port that carries the power and speed of the iMac’s USB 3 (also USB 2 compatible for older models) to the base of your iMac. It has a flat USB cord that will snake under your iMac and to the back USB port. All the instructions you need are in the following graphic and a 15% off offer follows:
The big thing here is the quality: the housing is 100% aluminum and it is designed to fit perfectly onto your iMac. Wiplabs is giving 9to5Toys readers a 15% discount when bought through Amazon
using code 9to5Toys at checkout which knocks it down to $34 with $4.50 shipping (offer is good for a week)