Hmmm, honestly I have never heard of any place selling reburbished Dysons. You could try Amazon marketplace, but if I were you would just keep an eye out at Best Buy. If someone buys it and returns it I think they have to sell it as reburbished (I could be totally wrong though).
Oh! You could also try Craigslist. You never know. Someone could be selling a perfectly good used one that they barely used. Also, we have had ours for over 4 years, we use the heck out of it, and it is still like new so you could get lucky! HTH!
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overstock.com has them and other warehouse-type online stores have them occasionally. If there is a Kohl's by you, I'd recommend waiting for one of their 30% off coupons (If you get their mailings or know someone who does). That's how I got my Dyson Ball and I love, love, love it. Worth every cent.
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