Least expensive WBO2 setup

That’s the thing, I’m not trying to cheap out at all, just looking for the least expensive one that YOU guys would recommend. If that one is $30 I’ll likely get it or if it’s $300 I’ll likely get it. Not trying to pay for more than I need, AKA not Defi or any ballin shit, just what gets the job done. I don’t care if it’s pink polka dot.