I have purchased two BIQU B1's and have been very happy with them. One for home use originally, and then my workplace was looking for a recomendation so I bought a second for work. They are cheaper then the Ender 3 V2, but have a few extra quailty-of-life features that make them a easier to use.
There is very little assembly out of the box, but I will say that both the B1's I dealt with had some minor troubleshooting involved to get them to work properly. If this is your very first FDM printer then those could be quite challenging to deal with, but if not I'd say they are definitely the best bang for the buck. You can get the printer and additional BLTouch probe (which I'd definitely recommend!), and some filament off amazon for less than $500.