3D TV was mostly the CE industry trying to get us to buy new Tvs and thus keep their losses down
for Television is is a doomed systems from having to have two optical paths tracking
with the interocular distance of under 80 mm (Cinema is a easier Greater than 200mm)
to the need to have autostereoscopic screens or strage glasses!
( Cinema a bit better but you lost 75% of the light)
But now very few panels are made at HD static resolution ..
SO get yourself a good 10 bit UHD1 display (with HLG and PQ based HDR)
I believe the last major brand to launch a 4K 3D TV was LG with their 2016 flagship models, but they didn't include 3D in the 2017 models and haven't since. A quick search didn't yield any results for new options, but I did find some recently-expired listings on eBay.
A colleague who used to work for a large tv manufacturer (not sure which one) told me a while ago that they had a large batch of 3D TVs which couldn't be sold, so they disabled the 3D functionality and sold them all to a large hotel chain. Unsurprising, really!
Our last 3D capable TV was a Sony UHD/4K SDR display with passive 3D (which gave Full HD 3D resolution - unlike the passive 3D Full HD sets that drop to 540p). When we upgraded to a newer Sony UHD HDR display, that no longer offered 3D functionality.
As others have said - 3D is no longer a thing (and 3D Blu-ray releases seem to be becoming less frequent now too) - your only real hope is to get one of the last generation LG OLEDs with Passive 3D I'd have thought if you want a reasonably decent UHD HDR display with 3D. Chances are this will be second hand unless you can find a new-old-stock model somewhere.
These days the only domestic 3D UHD/4K viewing solutions are projectors I think.
You need to have the left and right eye camera optical axis think centre line
Typically 76 mm apart /not easy with practical set ups unless you use a mirror rig
Sheet of glass one camera looking straight through the other looking up or down .
And then tracking their zoom and focus ... (with gravity at 90 degrees)
And the not obvious...... there is one reflection in one path there is one eye
being polarised which means Speculars look different between eyes .....
It a lot easier to get 76mm inter ocular when you are rendering a cgi movie..
And the doing are render at say 200mm for theatric presentation ...