I do some curing. You want to control temp and humidity. My budget solution was to buy a wine fridge. The wine fridge does not dehumidify. It holds 50-55 degrees pretty well. I put a large bowl of salted water in the bottom to help keep the humidity up. It has a small fan that helps circulate the air.
I spent a few bucks on a decent hygrometer, but other than that my overall investment was fairly low.
Klose 20 x 48, Stainless Performer, Smokey Joe Platinum, stainless hibachi, coal rotisserie, cinderblock hog cooker