FB marketplace is your best bet to get a good quality grinder for way under retail.
I got my newest (to me) grinder, which is a 1 hp, for less than I paid for my .35 HP new several years ago. Barely used, all I had to do was give it a good cleaning.
LEM is the brand I would focus on, and get the most HP you can. I went from a .35 HP to a 1 HP when i found a deal i couldnt pass up and it is a night and day difference.
No matter what, you want something that has metal internal drive gears and metal components (tray, auger housing, etc).
Weston, Hobart, LEM...all good brands. Cabelas is pretty solid as well, but IMO you are paying as much for the nane on the side as anything.