I did not see any on Amazon except some cheaper blenders that had one attached.
I do see that HotelRestaurantSupply has one for $183.56. Of course, you would need to check the measurements to see if the Vitamix would fit inside.
Whisperblend seems to have 3 sizes in the same price range upwards to $230.
One thing I noticed about this Vitamix TSV is that it doesn't include the other container for grains or the Aerodisc. Usually they include one or the other. Don't know how the price compares to those deals. One of those canisters runs about $150.