What to buy wholesale

[Jake Smith]

Afternoon all, I’m just starting back into the rental business after about a 15 year break. Over the past  3 months we have gotten 9 amazing single family homes under contract. My plan is to Burrrr them and hold them. So getting to the point. The houses we bought are in rough shape and need a whole interior / exterior upgrade. They were built in the 60/70s.
My question is. What materials are cheaper to buy wholesale, and what is easier to just pick up at the big box store? I have found many deals for wholesale LVP / light fixtures etc. Any advice is welcome.