Fry's Electronics offers the NERF Portable Speaker in Red, model no. N202, for $4.99 plus $1.99 for shipping. (You can also choose free in-store pickup.) That's the lowest total price we could find by $15. Compatible with most devices with a 3.5mm jack — including the iPad, iPod, iPhone, and most Android and Windows phones — it features rubberized bumpers. It requires two AA batteries (not included).

Regular Price: $15

BUY NOW: $5 + $2 s&h at Fry's