There's a bitter divide in the world of Android hardware: those who love expandable storage and those who don't. (There are a few who are indifferent and level-headed, but they never seem to speak up in the comments section.) If you fall into the former category, head over to Amazon's Gold Box one-day deal page. They're selling Transcend brand MicroSD cards for dirt cheap.
You can pick up a 32GB MicroSD card for $13.99, more than $20 off of Amazon's regular price.