He may be, but over the last few years some models have come out with much lower prices: <a href="http:&#x2F;&#x2F;appleinsider.com&#x2F;articles&#x2F;14&#x2F;11&#x2F;23&#x2F;review-flir-one-and-seek-bring-thermal-imaging-to-iphone" rel="nofollow">http:&#x2F;&#x2F;appleinsider.com&#x2F;articles&#x2F;14&#x2F;11&#x2F;23&#x2F;review-flir-one-an...</a><p>I wouldn&#x27;t be surprised if there are usable thermal imaging sensors out there for $100.