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Amazon.com has Vitamix Personal Cup Adapter – 61724 on sale for $ 87.99. Shipping is free for Amazon member.

The personal cup adapter works with your legacy-series Vitamix Machine to make individual blends or quickly chop ingredients for any recipe.
Two dual-purpose 20-ounce blending containers become Travel Cups with spill-proof lids
Dishwasher-safe components make clean-up easy. Compatibility- For use with Vitamix Classic machines only: 5200, 5300, 6300, 6500, 7500, 780, Aspire Series, Creations Series, Professional Series, Total Nutrition Center, TurboBlend Series, Explorian Series. Not compatible with Vitamix Ascent Series machines.