Looking to add a little protection to your iPhone 4/4S on the cheap? Amazon has two great offers today on the Body Armor case and Acase screenprotectors. The Body Armor case (blue) looks a lot like the Otterbox, but much cheaper at only $4 — the lowest price we could find online by almost $7. As for protecting the screen, Amazon has a deal on Acase screen protectors which are priced at $6.95, today. The screen protector pack comes with three clear front and back films.