For about $100 in materials I made a nice enclosure for my Creality CR10s printer. An enclosure is very important for reliable prints, especially when printing with abs. All materials were purchased from the Home Depot, but I'm sure you can find similar items at any hardware store.
Even if you have a different style printer, hopefully this video will give you some ideas. I opted to build my own vs buying a prefabbed one. The ones I liked were pretty expensive. I almost went with one of the printer tents, but some of the zipper/seam reviews scared me away.