I would like to know how much these games would be worth.

Smackdown vs Raw 2008
Street Fighter: Anniversary Collection
Dragonball Z: Budokai Tenkaichi 3
MVP Baseball 2005
Midnight Club 2
Crash Bandicoot: The Wrath of Cortex
Smackdown vs Raw 2006
Techu: Wrath of Heaven
Dragonball Z: Budokai 2
Final Fantasy 10
NBA Street
Dragonball Z: Budokai
Grand Theft Auto: San Andreas
MLB Slugfest 2003

Thanks.

For a good idea check eBay.

Honestly, if you took them to your nearest Game or Gamestation, then you'd probably only get a couple of quid for each, sorry to disapoint you.
But, hey, again, you could put them in the classified section of your local paper, and maybe sell them as a job lot for something like £30.
Again, it depends on the quality of the discs/case/instruction manuals etc.