I posted the PS4 version last night, but this was still £15.99 then, heat added.

For those who don't have PRIME... here are a few alternatives:

Tesco (£15) - http://www.tesco.com/direct/rocket-league-collectors-edition-xbox-one/437-3060.prd
Base (£15.49) - http://www.base.com/buy/product/rocket-league-xbox-one/dgc-rklegx1.htm

PS4:
Tesco (£15) - http://www.tesco.com/direct/rocket-league-collectors-edition-ps4/117-6748.prd
Base (£15.85) - http://www.base.com/buy/product/rocket-league-ps4/dgc-rklegps4.htm

If I buy it and play it on my xbone, can I then take it to a friend's house and play it there, without having to sign into my Xbox account or any of that nonsense?

Heat for Rocket League, and the new Rumble game mode is great.

Come on all you noobs, buy this so I can beat you.

I would've paid £40 for this when it was released. The number of hours I've put into this masterpiece is unhealthy! One. More. Game.