Look on eBay. Make sure if you purchase one there that the seller has a lot of sales and an excellent seller's rating. They won't want to ruin their good standing to purposely sell a fake one and if you found out that it was, then would most likely give you a refund in order not to have that on their ratings. Worse case scenario if they would be dumb enough not to issue you a refund immediately, then escalate the claim and have eBay step in.