The official Dyson store on eBay has the Dyson V8 B cordless vacuum on offer as refurbished for CDN$299.99.
From my own experience I can say that all Dyson refurbished products were as good as new if not new. Also go and check out the other items available. Their eBay store has usually the best prices available anywhere for Dyson products.
Item condition: “Possible colours: Titanium / Blue / Yellow. Our refurbished machines have been thoroughly tested to meet like-new performance standards. Units may have some cosmetic blemishes that include scratches and/or other surface imperfections, that do not affect functionality. Refurbished machines are final sale unless defective. Ships in non-retail box. Colour may vary. Seller does not ship to P.O. Boxes”