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I bought one about two months ago:
linky
Actually, I got the 5.1 because they were out of the 4.0 and they upgraded me for free. It just has a bigger, fancier display.
I found a 15% off coupon code online so I got it for $466. I love it and use it almost every day. Like running but without the impact on knees and back.
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cool, good to know there are some cheaper ones out there that seem good. maybe i'll just end up getting one like this.