Comforter, NOT duvet

I’m looking for a heavy and relatively thick comforter, but it doesn’t have to be very puffy. I don’t really care about my bed looking like a cloud, but I do need it to be heavy enough to meet my sensory needs. I want a COMFORTER ONLY, not a duvet. I currently have a duvet and a goose down comforter inside and it slips and moves even while tied and it drives me crazy so I want a 1 piece easy peasy comforter. Price range is preferably under $100 but willing to go up to $150ish!