Costco.
I bought our vitamix there because there are no shipping charges and if there is a problem, you can always return it to Costco directly.
They sell Blendtec at Costco also. They have traveling sales demo people periodically.
I like vitamix due to the variable, manual controls. The digital technology of the Blendtec seemed a bit too much like trying to program a DVD player.

'Choose 2 for soup, 4 for nut butter, do this then that to make dough', too complicated for me!
I bought the smaller vitamix container ($90 extra) and it fits under my cupboards. The tall container is rarely used and is stored in the pantry.
Also, the vitamix container was BPA-free. Blendtec may be now also, I believe.
HTH, Pat