I needed a replacement power cable to recharge my cell phone. I went to MicroCenter and inadvertently bought a mini USB to USB cable, I needed a MICRO USB to USB cable. The one I bought was $19.99. The cable that I eventually found in the cellphone accessories aisle was only $9.99, and has one USB socket at one end, and then both a mini USB and a micro USB socket at the other end.
Only way to get one cheaper would probably be from DealExtreme in China.
Here it is: