Nest Cam - Typically retails for $199. Dropped to $139. If you purchase from BHphoto and live outside NY/NJ there is NO SALES TAX. If you have coupons (rewards points, or google express coupons) saved up may be a better buy purchasing from Best Buy, Google Express as they now have the same price.
If you have a Lowes $20 off of $100 coupon, you can get it for $139 - $20 for a price of $119 plus tax. Lowes coupons can be found online or do a search on Slickdeals forums.