LocalBitcoins.com is a decentralized marketplace where people from all countries of the world can change their local currency <–> crypto-currency. It allows its users to post offers where they state exchange rate, and payment methods for buying or selling bitcoins. You reply to them and agree to meet the person to buy bitcoins with local currency, or trade directly with online banking. Bitcoins are placed in LocalBitcoins.com web wallet, escrow that works really well.
Local bitcoin is a nice piece of decentralized platform.