If it's a disc version it should come with a code as well. You need one to register it I believe.
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This is a link to a list of places which have sales of the Sims 4 game and the packs. It may help you in purchasing a digital copy of GTW.
https://simsvip.com/2016/11/23/best-black-friday-discounts-sims/
http://forums.thesims.com/en_US/discussion/817478/hello-come-and-introduce-yourself
http://tinyurl.com/OneRoomOneWeek
http://tinyurl.com/rosemow
My Showcase thread https://forums.thesims.com/en_US/discussion/948861/rosemow-s-rooms-showcase