Gamesalor International via Amazon offers the Bone Collection Amplifier for Apple iPhone in Green, model no. 80396, for $4.97 with free shipping. That's a buck under last week's mention and $16 less than the lowest total price we could find for this in any color. This silicone stand purportedly adds 13 decibels to your iPhone's speaker without power. It fits the original iPhone, iPhone 3G/3GS, and iPhone 4.

Update: It's since fallen to $4.44.