As reported on IGN.com as well as VideoGamer.com, Amazon is restricting the purchase of some video games to only Amazon Prime members. Highly profile titles such as Grand Theft Auto V, FIFA 16, and Assassin’s Creed Syndicate can only be purchased on Amazon if you are an Amazon Prime member. Amazon Prime membership currently costs $99 annually so users would need to purchase an Amazon Prime membership on top of the cost of the game as well.
Customers can still buy the games from third party sellers without a Prime Membership but if you want to purchase the game directly from Amazon, the Prime Membership will indeed need to be in order.
I reached out to a concerned Amazon rep who additionally notified me that he would forward the information on to the appropriate teams. The chat transcript can be seen after the break:
Me:Gunasundari:Me:Gunasundari:Me:Gunasundari:Me:No problem I appreciate your honesty! Gunasundari:Me:Gunasundari: