Here are some resources for practicing speech sounds at home:

http://mommyspeechtherapy.com/?page_id=55

http://www.juniorsweb.com/slp/index.asp

http://heatherspeechtherapy.com/worksheets/

S'More Articulation Game

If you're looking for an articulation app for your tablet, I use Pocket SLP, which is available for Android and Apple products.