eXpansys offers the AMZER Perforated PolyCarbonate Case for Galaxy Nexus in Black (pictured) or Black/White for $5.50 with free shipping. That's the lowest total price we could find for this case in these colors by at least $4.

Need something more colorful? AccessoriesGuyStore via Amazon offers it in Pink for $2.75 plus $2.50 for shipping. That's a price low for this color by about 25 cents.