You make drugs!?!
Scandal
Mag stirrers are a very useful piece of lab equipment. Particularly if they can heat too.
I wouldn't mind muddling through DMT extraction without one, I've done it before, but I'd be damned if I'd force myself to make mescaline without one.
At one point I didn't have a functional one when I decided to make THH, so rather than waiting for shipping I built a mag stirrer out of a computer fan and an old hard drive [they contain great magnets].
There are three basic grades. Adjustable stir-only, uncontrolled heating plus adjustable stirring, and adjustable heat plus adjustable stirring. Though I have seen antique ones with only one speed setting. Think carefully about which one you'll need now, and in a few years. Getting the cheapest version now might not make sense if your going to be steadily increasing your lab activities over time.
A centrifuge can also be very handy in the lab.