1 marketplaces are offering it on Ebay with coupons. Also mini bluetooth stereo audio transmitter is one of the top sellers in CHBC in 2021.

Description: 100% and Connect to Bluetooth-disabled audio device 3.5mm plug, make it to work with Bluetooth A2DP headset/speaker. audio fit for most kinds devices, such as Plug and need li-battery, can charged.
Compact and lightweight.
Bluetooth Bluetooth A2DP 2.4GHz~2.4835GHz to 10m DC Rechargeable time: Approx. hours Working hours Color: Black Size: Approx. * * 0.8cm / * Note:  Size for manual may be 0 to 2 cm error, belongs to phenomenon.  the difference between different monitors, picture not reflect the color of the item.
Thank you!.
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