Airbay via Amazon offers its Airbay Adjustable Child Safety Strap Lock 6-Pack for $14.95. Coupon code "PJBB7GDJ" cuts that to $10.46. Plus, Prime members bag free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $6.22.) That's $15 off list and the lowest total price we could find. Each lock features a 3M adhesive tape catch.