NEXUS 5 is $50 cheaper, if you buy directly from Google Play Store :

Google is selling its Nexus 5 Android smartphone at around a £50 less than other retailers can buy it, according to one retailer. The much-anticipated new flagship smartphone costs £300 directly from Google’s own Play store.


While it is unknown how much Google pays for each unit of Nexus 5 from its manufacturing partner LG in South Korea, other resellers are "able to buy the phone from LG for around £350" according to a retail source talking to the Guardian – £50 more than Google is currently selling the phone for on the Play Store.

“We saw the same thing with the Nexus 4,” explained Ben Wood, mobile analyst with research firm CCS Insight. “With the Nexus line, Google always goes for very aggressive pricing with its manufacturing partner.”

The advantage of being part of Google’s Nexus programme is early access to new versions of Google’s Android operating system, which gives device manufacturers a leg up on the competition and Google leverage over their partner.