huh?

http://www.amazon.com/Megalert-Mega-.../dp/B000AOA3DA

Even better, spend more than 75USD and shipping is free
edit: D'oh they only have 3 units at amazon


http://www.cyclingsolutions.com/Play...productadded=1
Available here as well for $20USD each (instead of $18USD), but ships via USPS (~$20USD for shipping 4 units)