Amazon offers its Amazon Prime members the OtterBox Defender Series Case for Apple iPad in Black, model no. APL2-iPAD1-20-C4OTR, for $12.99 with free shipping. (Non-members can spend over $25 to qualify for free shipping; otherwise, shipping adds $9.19.) That's the lowest total price we could find by $5, though we saw it for $3 less a week ago, since expired. The multi-layer case protects from dust, scratches, and bumps.

Amazon Prime membership is $79 per year; however, Prime is free for college students for six months, and free for parents and caregivers for three months. (There is currently a waitlist for Amazon Mom.)