I guess I'd be pretty upset too if I was a backer of this Kickstarter. Nothing sucks worse than seeing the product you've been waiting a year for show up for sale to the public on Amazon. 
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Last August, one of the most financially successful Kickstarter campaigns of all time concluded. It was a cooler called the Coolest, which was pricey but promised to contain most of what you need for a beach party. $300 backers were supposed to receive the Coolest, which would retail for $500. Then backers noticed that the product was available on Amazon’s crowdfunded products section… even though original backers from over a year ago hadn’t received theirs yet.