This blender itself can be used just like a tumbler.
Brad's Deals Editor Michael,
This BlendJet Portable 12-oz Blender that comes with three Smoothie JetPacks drops from $51.98 to $35.98 with free shipping at QVC. This is the best price we found for the blender by $4 and the three included smoothie packs save you an additional $12. The blender is available in 11 colors. It's about the same size as a 12oz tumbler and is battery-powered, so you can bring it with you and make smoothies on the fly. A USB charger is included. Sales tax is charged in most states.