I use this:

https://www.amazon.com/dp/B08F7BYFLJ?th=1&psc=1

Got in in amazon.de, it cost me 90 EUR or so? That's roughly 95 USD. You can probably find a similar product on your local amazon, it's a rebranded Pull Up Mate, I think.

I've had it for almost 3 years now. It's been ok, I haven't trained every single day on it, for a long time it was a glorified clothes hanger (let he without sin cast the first stone!).

I mean, there's definitely things I would change. Its a bit short, so I have to tuck my legs a tiny bit when doing pull ups, and I'm only 166 cm tall. You can tell it "bends" a little when you hang from it (and I've never been extremely fat). It's not as portable as the pics show, it takes a while to dismount.

However for what I wanted it's perfectly fine. I also thought the same, no point in spending a ton of money on something like this just for getting started.