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Here are the most useful Bluetooth options, grouped by what you’re trying to do:

Add Bluetooth to a computer (USB dongles)

• Cheapest basic option (older standard): Bluetooth Adapter Mini (Bluetooth 2.0) ($6.30)
• Add Wi‑Fi + Bluetooth in one: Combination WiFi + Bluetooth 4.0 USB Adapter (Bluetooth 4.0) ($33.00)
• Nano combo adapter with newer BT: Edimax 2-in-1 Wi-Fi 4 N150 & Bluetooth® 4.2 Nano USB Adapter (Bluetooth 4.2 + Wi‑Fi N150) ($35.05)

Bluetooth for microcontrollers / embedded projects (data/serial & BLE)

• UART-to-Bluetooth serial bridge: BlueSMiRF v2 Bluetooth Serial Link with JST-GH (Bluetooth serial/UART) ($23.90)
• Easy BLE add-on board (UART-style): Bluefruit LE Friend - Bluetooth Low Energy (BLE 4.0) - nRF51822 [v3.0] (BLE 4.0) ($40.10)
• Multiprotocol RF module: BMD-34 Bluetooth 5 / Thread / Zigbee Module with U.FL (Bluetooth 5 + Thread + Zigbee, U.FL antenna) ($39.35)
• Built-in BLE dev board: Circuit Playground Bluefruit Bluetooth LE Board (Bluetooth Low Energy onboard) ($61.35)
• Wi‑Fi + Bluetooth MCU module: ESP32(ESP-WROOM-32) WiFi Bluetooth Dual-Core MCU Module (Wi‑Fi + Bluetooth/BLE 4.2, dual-core) ($13.05)

Bluetooth audio (make powered speakers / add wireless audio)

• Simple receiver module: Bluetooth 5.0 Audio Receiver Board (Bluetooth 5.0) ($4.75)
• Receiver + amp for small speakers: Bluetooth 4.2 Audio Receiver Board-with an Amplifier (2x5W) (2×5W amp) ($6.30)
• Higher power amp: HIFI Digital Bluetooth Amplifier-50W*2 (2×50W, Bluetooth + AUX) ($27.55)
• Bluetooth 5.0 amp module: Stereo Bluetooth Amplifier Board (Bluetooth 5.0, speaker amp) ($15.70)
• Most flexible playback (BT + USB + microSD, decodes FLAC): Bluetooth Audio Receiver and Playback Module ($24.85)

Bluetooth peripherals

• Compact keyboard: Mini Bluetooth Keyboard – Black ($26.00)