The Ninja, for example, sells for under $250 and does just about everything the Vitamix can. Both companies' blenders have an average customer rating of 4.5/5 stars on Amazon.com. On Costco's ...

If you want awesomely smooth smoothies, a Vitamix is a must-have appliance. (Mine was worth every expensive penny.) And you could definitely do worse than picking it up from Costco. The Vitamix ...