Home improvement and hardware stores usually carry sand for sand blasting. There are also specialty stores that sell sandblasting equipment along with sand and other blasting media.
Most hardware and home improvement stores, such as Lowe's or Home Depot, carry sandblasting media. The appropriate medium depends on the task at hand. For projects requiring a delicate approach, a biodegradable medium such as walnut shells or corn husks is best. For a softer, brighter finish, specialized glass beads are recommended. Plastic beads should be used when cleaning vehicles, and abrasive materials such as sand or silicon carbide are recommended for tough jobs.