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If you are considering any major tech purchases in the next year looks at past trends and tries to tell you whether something is likely to go up or down in price and will also send you a notification if something you are watching does drop in price. If they say something is not going to drop in price and it does within 14 days of your purchasing it then they refund you the difference. Normally it's $30 a year, but it's reduced to $10 with the wirecutter deal and they give you a $10 Amazon gift card, hence free. 

I've already saved $100 on a receiver using it so I'm pleased and I even missed out on the sweet $10 Amazon gift card part of this deal.
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