My decades-old FT-470 can do true full duplex too, but it's less common in current radios. Just dual watch now.
If a D72 is your cheapest HT, then well, congrats.
An incomplete list of full duplex vhf/uhf cross-band FM radios can be found in this reddit comment: https://www.reddit.com/r/amateurradio/comments/97jhik/gettin...
AFAIK the only options are TH-D72 and Wouxun Dual.
See this video of John Brier KG4AKV with his front-backpack TM-V71A mount. https://www.youtube.com/watch?v=w7Ukh_nT2Tg
My decades-old FT-470 can do true full duplex too, but it's less common in current radios. Just dual watch now.