Bed Bath & Beyond has Miele Compact C2 Electro+ Vacuum (Marine Blue) on sale for $479.99 - 20% unique coupon (New Customer Email Sign-up) = $383.99. Shipping is free. Thanks mrspeed
Note, from the Bed Bath & Beyond homepage you should see a popup window that says "Connect with Us" and asks for your email address. Once you sign up for emails the 20% off coupon will be added to your wallet and you can apply this offer at checkout.
It also seems to be on sale at Bed Bath & Beyond for the same price, though you can usually get it there for around this price when you apply a 20% off coupon, since $600 - 20% = $480 (I'm not sure if a 20% off coupon can be stacked onto sale items such as this to get it even cheaper).
EDIT: According to the other commenters, the 20% off coupon does indeed work on the sale price, taking this down to $384 plus tax. Not sure if I should edit the title of the post to reflect this though, since there may be some without a coupon (though they're pretty much everywhere):
Last Edited by stuff4dave
January 9, 2018
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Pronounced Mee-luh like tequila
Discover Cashback can be redeemed for BBB giftcards/e-certs at $50 giftcard value for $40 in cashback dollars.