QVC has the Dyson V11 Torque Drive on sale for $499. This is different than the V10 Absolute deal going on right now. MSRP on V11 is $699, and currently listed for $699 on Dyson's website. For anyone following this V11 Torque version, it is a pretty good price. Both the vV10 and V11 are similar, though the V11 offers about 30% more suction, has a digital battery monitor (with time remaining readout). There are several websites that offer comparison reviews. Note this is for the more expensive V11 Torque, not the less expensive V11 Animal (without the digital readout screen available at Costco).
I get that there will be many debates about which version is worth the money, but strictly speaking for the V11, this is a good price. I don't post many deals, so please be gentle.