Cambond via Amazon offers its Cambond Waterproof Wireless Doorbell Kit with LED Flash for $22.99. Coupon code "8WTY9TQV" cuts it to $16.99. Plus, Prime members bag free shipping. That's $3 under last week's mention, $20 off list, and the lowest price we could find. It features a 500-foot wireless range, two receivers, 58 ringtones, four volume levels, and four sound/LED modes. Deal ends July 25.