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DIAspoton habitat restore, goodwill. call kitchen designers.remodelers to see if they're discarding cabinets and ask if you could take hardware if you remove it yourself. you can spray paint old brass knobs with rustoleum special finishes like oil rubbed bronze.

or google knobs and shop around a bit.

apple_pie_order Rockler Woodworking has unfinished wood knobs. Builder packs of most brands are discounted slightly from the individual price. Sometimes you can find used knobs on ebay, often an entire kitchen's worth. Inexpensive brands include Amerock.