From $299 to $199, Nexus 4 managed to become the first high-end smartphone that costs less than $200 off contract. Google's previous Nexus phones used to cost about $529, but Nexus 4 changed all that. Google subsidized the phone in an effort to make the phone more affordable.
It's amazing to see how much has changed since 2010, when Google released the first Nexus device: Nexus One. Hardware has improved a lot, Android has a great interface, Android apps are better, Google built a content store, Android is the leading mobile OS and you can buy powerful phones and tablets for about $200 (full price).