Buying rehab materials besides Home Depot

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Where does everyone source their rehab materials? Home Depot? Lowes? I have never rehab a place but feel the big box stores can't give me the best quality and prices. Not sure about liquidator stores either. Strategies? Private vendors on custom items like countertops, cabinets, windows, etc. getting quotes or negotiating prices on bulk buys like wood floors, tiles. A lighting designer or someone that understands flow of a unit. That probably can just be intuition and personal feeling as well. Thanks