localbitcoins.com enables cash-to-bitcoin trades with private people who live near you. It would be difficult to buy $20,000 worth of Bitcoins in one shot for a

localbitcoins.com enables cash-to-bitcoin trades with private people who live near you. It would be difficult to buy $20,000 worth of Bitcoins in one shot for a favorable rate, but you can get significant amounts without going through too much hassle.