While Raspberry Pi certainly is a cheap mini-computer, adding accessories to it blows up ownership costs a lot. While adding WiFi is relatively cheap, finding a compatible Bluetooth Low Energy 4.0 (BLE) for a bargain is hard. Luckily, I found the Orico BTA-403 Mini Bluetooth 4.0 Adapter Dongle which comes with CSR8510 Low Energy Chip and is compatible with Linux and Raspberry Pi despite being not listed as such in the description, this is certainly a must-have deal for $8 including worldwide shipping. Instructions for setup are as shared below.