Google Play cuts 40% to 80% off a selection of Dr. Seuss Android and iOS apps, with prices starting at 99 cents. (iTunes offers many of these for the same price.) At up to $4 off, most are at or near the lowest prices we've seen.

A best bet is The Cat in the Hat by Dr. Seuss for Android (pictured) for 99 cents. (iTunes charges the same for iPhone, iPod touch, and iPad.) That's $3 off and the lowest total price we could find.