BH Photo Video has TP-Link HS200 Smart WiFi Light Switch on sale for $17.99 -> Now $17.09 when you 'clip' the 5% off coupon located on the product page. Shipping is free. Thanks braddley5
Amazon.com also has TP-Link HS200 Smart WiFi Light Switch on sale for $17.99 -> Now $17.09 (price reflected at checkout). Shipping is free w/ Prime or on $25+ orders.
Note, Amazon Prime Credit Card holders will receive 15% back (instead of 5%) when using an Amazon Prime Card to purchase. [more info]