Since you are new to this you may be thinking that you need a smart trainer in order to Zwift. You don’t. Unless you really think you’ll be Zwifting a lot and possibly want to race I would recommend buying a classic trainer, like a used cyclops fluid trainer for $100 or so, add a speed sensor to your rear wheel (you can get a Magene sensor from Ali or maybe Amazon for $15-$25) and then you are good to go. Try the Zwift free trial to see if you like it and go from there. You can buy a wheel-on “smart” trainer where Zwift will control your trainer but these cost quite a bit more and a direct drive trainer is considerably more.
If in the US a brand new Saris M2 (wheel on) is $499. Check Craigslist for used Saris or Wahoo Kickr Snap. If in Austin I have a Snap or a H3 (no power supply) that I can sell you. For used DD the best I have seen is around $600 for Hammer 1 (Saris). Much like RV’s, the used market is currently inflated due to people staying at home.
I think Tacx (now Garmin) has a lower cost unit but the name escapes me. Seems like Elite are hard to come by.