Looking at the ever-increasing Bitcoin price and wondering how to get in on the action? One way to dip a toe in the water is to buy a cheap older-model Bitcoin miner, such as the Bitmain Antminer U3. These run around $100 on eBay currently and are a proper ASIC-based Bitcoin miner with very low power consumption. It connects to your computer via USB, and requires software like cgminer to connect to a mining pool. Other USB based Bitcoin miners exist, and while the following instructions are for the Antminer U3, the process should be similar for any other USB Bitcoin miner.