Plugable USB Bluetooth 4.0 Low Energy Micro Adapter (Windows 10, 8.1, 8, 7, Raspberry Pi, Linux Compatible; Classic Bluetooth, and Stereo Headset Compatible) (c9dd1431cea567a472efe28009a43bf0) - PCPartPicker

Plugable USB Bluetooth 4.0 Low Energy Micro Adapter (Windows 10, 8.1, 8, 7, Raspberry Pi, Linux Compatible; Classic Bluetooth, and Stereo Headset Compatible) ( c9dd1431cea567a472efe28009a43bf0) - PCPartPicker

Bluetooth 4.0 USB Module (v2.1 Back-Compatible) : ID 1327 : $11.95 : Adafruit Industries, Unique & fun DIY electronics and kits

Plugable USB Bluetooth 4.0 Low Energy Micro Adapter (Windows 10, 8.1, 8, 7, Raspberry Pi, Linux Compatible; Classic Bluetooth, and Stereo Headset Compatible) ( c9dd1431cea567a472efe28009a43bf0) - PCPartPicker

Add Bluetooth to Windows PCs & Raspberry Pis

Penguin USB Bluetooth 4.0 Micro Adapter (TPE-USBBLUV4)

Panda Bluetooth 4.0 USB Nano Adapter - Windows XP/Vista/7/8/8.1/ 10/11, Mint, Ubuntu, Fedora, openSUSE, Lubuntu, Zorin, BackTrack5 R3, Kali Linux, Raspbrian Wheezy and OpenELEC : Electronics

Plugable's USB dongle is yet another cheap way to add Bluetooth 5.0 to your PC

Plugable USB 2.0 Bluetooth® Adapter – Plugable Technologies

Plugable USB 2.0 Bluetooth® Adapter – Plugable Technologies