Bluetooth 4.0 USB Module (v2.1 Back-Compatible) : ID 1327 : $11.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Combination WiFi + Bluetooth 4.0 USB Adapter : ID 4827 : $14.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Asus USB BT400 Bluetooth 4.0 Bluetooth Adapter for Desktop ComputerNotebook USB 3 Mbits 2.48 GHz ISM 32.8 ft Indoor Range External - Office Depot
USB Bluetooth 4.0 Adapter - 10m Class 2 - Bluetooth & Telecom Adapters | StarTech.com
Bluno Link - A USB Bluetooth 4.0 (BLE) Dongle - DFRobot
Bluetooth Adapter for PC，Techkey USB Mini Bluetooth 5.0 EDR Dongle for – mytechkey
Port Dongle Adapter For Car Bluetooth 4.0-JVC KS-UBT1 Audio Durable | eBay
Long-Range USB Bluetooth 4.0 Micro Adapter – Sonnet Online Store
For Dongle Adapter Connector JVC KS-UBT1 Audio Dual Mode Bluetooth 4.0 Useful | eBay
TP-Link UB500 USB Bluetooth Adapter for PC, Bluetooth 5.0 Dongle Receiver, EDR & BLE Tech | Lenovo US
Bluetooth Receiver Bluetooth Adapter Wireless Headset Headphone Adapter with Mic BT 4.0 Dongle USB Adapter USB Dongle for PS4 Black - Walmart.com
Hideez USB Bluetooth Adapter for Windows, macOS, Linux, Raspberry Pi
Mini Usb Bluetooth V4.0 Adapter Dual Mode Wireless Dongle Csr 4.0 Bluetooth Adapter For Windows 7,8,10 Pc Computer Laptop - Bluetooth Adapters - AliExpress
Amazon.com: Cable Matters USB Bluetooth Adapter (USB to Bluetooth 4.0 Adapter) for Windows 10, 8.1, 8, 7, Vista, XP, Raspberry Pi in Black : Electronics
USB Bluetooth Adapter PC 4.0, Wireless Bluetooth Receiver - Maxesla
Bluetooth 4.0 Mini USB Adapter | BTA8000 | Cirago
CSR USB BT 4.0 Bluetooth Dongle CSR8510 – ElectroDragon
Csr8510 Bluetooth 4.0 Dongle Csr 4.0 Adapter Mini Usb Bluetooth Adapter Transmitter For Windows Xp/vista/7/8/10 - Bluetooth Adapters - AliExpress
Amazon.com: SABRENT USB Bluetooth 4.0 Micro Adapter for PC 4-Port USB 3.0 Data Hub : Electronics
Tp-link Nano USB 2.0 Bluetooth 4.0 Adapter Golden | Techinn
Amazon.com: Plugable USB Bluetooth 4.0 Low Energy Micro Adapter (Compatible with Windows 11, 10, 8.x, 7, Classic Bluetooth, Gamepad, and Stereo Headset Compatible) : Electronics
UB400 - TP-LINK Bluetooth 4.0 Nano USB Adapter - MacConnection
