The online retailer is also selling Xbox 360 Elite for £249.99, with an RRP of £259.99.
The original RRP for the Arcade, Pro and Elite was previously set at £199.99, £279.99 and £299.99.
The move follows reports that the Xbox 360 price cut will be officially unveiled today.
The Arcade pack features no hard drive and a disc of Xbox Live Arcade titles, and was introduced last year. The Pro comes with a 20 GB hard drive and wireless controller, whereas the Elite boasts a sleak black design and a 120 GB hard drive.
UPDATE: It appears that since this story was posted Amazon's prices have reverted back to how they were. Stay tuned to MCV for the official announcement which is expected shortly.