I bought the largest "Senville" unit I could find from JustMiniSplits.com, 4 years ago. I think the unit was only $1300 or so. It is a walk-out basement. I hung the unit, ran power to it and hammer-drilled the brick for the exterior pad. I set the exterior pad and compressor and called my AC guy out to finish the job, release the charge and certify the install. I think he charged me around $350 and had done some other stuff for me, as well.
The unit works, I'm surprised that I've gotten 4 years out of it, honestly.
On the up side:
It blows cold in the hot Alabama summers
Acts like a great dehumidifier when I need it to
Can heat in the winter, though 16 games does a good enough job of that, usually
$1300
On the down side:
The reversing valve sticks when switching seasonally from cold to heat but I can usually free it with some power cycling
Unknown brand and support: Senville
It doesn't auto/off - at temperature and is controlled with a janky remote control
It doesn't have a traditional thermostat so I can add it to my Nest ecosystem
Other comments: Since it is a ductless system, insure that you have it in a place that can adequately spread the cool air or plan to install additional fans elsewhere to circulate the air. Before going to the mini split, I tried those roll-around A/C units that are the size of a large dehumidifier that you sometimes see in server rooms or labs for auxiliary cooling. Those didn't work for my case, at all and were terribly inefficient.
I've got a friend looking at one now for his garage, it sounds like the price differences between the off-brand and the trusted brands have started to shrink. Good luck with your search!