IMO I think CeX is the best place to trade in games, you will get ripped off in gamestop.

If you have a CEX local they would take them.

If you are offended by the price CEX offer you; try these because you could get more from privately selling them:

If you use Facebook your area might have a local selling page (mine does)
Use gumtree and post an ad for your local area

F4D wrote You can trade in your games in CEX better deals than GAME
You can go to GAME and get ripped off, your choice?

I traded in Black Ops 3 and Fifa 16 at Game and just chose to go for store credit so I could get steam cards and they price matched the CEX (2 doors down) and added a little extra on top. So perhaps If you just wanted store credit the i would just say Game

Cex over game any day, I remember game tried to offer me 150 for my ps4 AND GAMES. rip off merchants

CEX but I hear Asda have good trade-in value. Don't quote me on that tho.