Amazon offers Prime members the OXO Good Grips 3-Piece Stainless-Steel Mixing Bowl Set in White, model no. 1107600, for $44.99 with free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $8.73.) That's the lowest total price we could find by $15. The bowls have a plastic exterior and stainless steel interior, a non-skid bottom, and are dishwasher-safe. The set includes 1.5-, 3- and 5-quart bowls.
Update: Specs corrected.