Amazon offers Prime members the Fisher-Price Soothe and Glow Seahorse in Pink for $11.43 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $6.25.) That's the lowest total price we could find by $6, although we saw it for free with a $25 purchase during Black Friday weekend. It features a power/volume control and plays up to five minutes of music, eight lullabies, and soothing ocean sounds.

Orders placed by December 22 are guaranteed to arrive in time for Christmas via Prime shipping; otherwise, choose Standard shipping and place your order by December 18 for guaranteed delivery.