Cheapest To find the cheapest exchange, we looked at overall cost-effectiveness when buying BTC with fiat currency, including exchange commission fees, deposit and withdrawal fees, exchange costs and any other applicable fees. While Mycelium Local Trader works great in highly-populated areas, users in low population areas will have trouble finding sellers. Enter the amount you want to buy. So, should you buy Bitcoin from a US exchange or from a foreign platform? Wire transfer Online banking. That could give Bitcoin adoption a boost in the country going forward as potential buyers will have measures in place to protect their investments. Coinbase and Changelly are two well-known cryptocurrency brokers.