Bought a set of a car charger, charging cube, and three cables for $20 shipped off eBay from a US seller named "drgaddis". I would NOT recommend purchasing from him. Two of the three cables I have work sometimes and sometimes they don't. They are also not reversible like the real Apple chargers and don't charge as quickly as the real chargers. I'm in the process of getting replacement cables from him, that probably won't even work.
They worked fine the first few times, but now sometimes when I plug them in they stop charging after a while. Once, I plugged in the USB cable to my computer and my computer just shut off immediately. Other times, nothing happens at all when I attempt to charge (literally, nothing--no charge, no alert errors). Other times, it will say "Charging is not supported by this accessory." Once, I got the messages on my computer that said a USB adapter was drawing too much power from my computer and to disconnect the cable. As I write this, I am at work. I was able to charge my phone from 56% to 70%, but suddenly it just stopped charging. -_-
SKETCHY. I now no longer connect the generic cables to my Macbook Pro. Honestly, with all the hassle, I wish I had just spent that $20 on another real Apple cable. I float around between 3 residences (dorm, parent's house, boyfriend's house) and also like to have additional cables for my car, work, etc. It was nice to find such an amazing deal on eBay, but remember: YOU PAY FOR WHAT YOU GET.