I've moved on to a DJI Mavic 2 and no longer need the radio. It's been used lightly at best.
Charges and holds charge just fine. The item "Spektrum RC DX8 2.4GHz Transmitter Radio & AR8000 Receiver" is in sale since Sunday, March 3, 2019. This item is in the category "Toys & Hobbies\Radio Control & Control Line\RC Model Vehicle Parts & Accs\Control, Radio & Electronics\Receivers & Transmitters".
The seller is "pbraun12061966" and is located in Middleton, Wisconsin. This item can be shipped to United States.