The Only Painting Supplies You Really Need
Buy a nine-inch roller with a good, sturdy arm (such as the Wooster Brush Company Sherlock Roller Frame, $8.50, homedepot.com) and a roller sleeve of the same size. For smooth Sheetrock or plaster walls, buy a sleeve with a 3/8- or 1/2-inch nap (nap is the degree of fluffiness). For textured walls, like stucco or brick, get one with a 3/4-inch nap. A quality roller sleeve holds more paint and makes the whole job easier than a cheapie version.
See our Painting Supplies Checklist for an extended list.