Standing desks are really cheap now
I have one and it only cost about 200$ which is pretty decent for any kind of desk, i think. it's big too, like an L desk.
just some made in china shit, but has buttons that make the motor move it from sitting to standing and you can set it to remember certain heights. bitch to put together but it works and i dont hate it.
idk about the health benefits or w/e but at the very least think its good for posture/back just bc sitting in chairs all day fuckin sucks.
have tried all sorts of computer chairs, even had a herman miller for a while but am now of the opinion that a good posture comfortable computer chair just does not exist.
another thing i got was a foot stool to put under my desk
this i actually like and they're really cheap

smth like this. it has screws on the side so you can adjust the height so its right for you and your chair
takes the pressure off your thighs when you sit and they got little roller things on them that feel nice if you got socks on (your fucking feet hurt from standing at your standing desk)