While Google (NSDQ: GOOG) is already dropping the price of some of its Nexus One devices by $100, others are hoping sell them for much more on eBay.

Google has now change the pricing options of the Nexus One. For a completely unattached, unlocked version, it remains $529, but for T-Mobile customers who are eligible for a phone upgrade the price has dropped to $279 from $379. And, for those signing up for new two-year T-Mobile contracts, it costs $179. Google explained the reason behind the change to PhoneScoop.com: “Previously there were two price points for those fully eligible for T-Mobile upgrades. Those without data plans were paying $279 for the Nexus One, and those with data plans were being charged $379. We worked with T-Mobile and are now able to offer the higher upgrade discount to all existing fully eligible T-Mobile subscribers.”