Source #1

Builder supply — the right answer for most cabinet, lumber, and tile needs.

A local builder-supply yard is where the pros shop, and it's the default for any material that comes in bulk — cabinets, lumber, drywall, tile, decking groups. The prices run 15–30% below the big-box stores because the buyer is the contractor, not the weekend DIYer. If your flip's line items include a kitchen, a bath, or a deck, start here before you comparison-shop.

Source #2

Salvage yards — cabinets, doors, fixtures — for the patient flipper.

Architectural salvage is the right answer when the line item is a finished good — cabinet doors, a clawfoot tub, a five-panel interior door, a pendant light fixture. The yard carries inventory that was pulled from a remodel job, and the pricing scales with the buyer's patience — visit weekly, walk the racks for an hour, leave with a deal the big-box store will never match. Plan to spend more time than money.

Source #3

Paint shops and contractor outlets — trade pricing for the small stuff.

A gallon of paint at a paint shop runs 20–35% less than the same color at a big-box store, once you've opened a trade account. The same is true at contractor outlets for plumbing rough-in, electrical boxes, fasteners, and the hundreds of small items that add up across a punch list. Visit once to open the account, then lean on it as the default for everything that's measured in single-digit dollars per piece.

Source #4

Use the directory, not your browser, to compare the swing.

The four source types aren't interchangeable. Each one holds a category discount the others don't, and the per-category discount swings widely even between two yards in the same ZIP. A real directory — the kind that lists every store near your ZIP with the per-category discount it carries — turns a four-hour search into a thirty-second lookup, and shows which ZIP-50 store beats which on which line.

The discipline

Don't shop in isolation — match the source to the line item.

A flipper who's loyal to one source overpays for the source's off-categories and under-buys for the on-categories. Match the source to the line item instead — the kitchen gets the builder-supply yard, the bathroom faucet gets the salvage yard, the paint gets the paint shop, the rough-in gets the contractor outlet. Layering the four sources per line item is what makes the budget reflect the swing — not the worst-case number — and that's where the margin lives.