If you want a super market one, I did a trial for Lipton Chai. I am a caffine addict and I quite liked this. I used to have Mocha's to to make my mind think I was doing the right thing while my body got the caffine hit
I have a box of the Lipton Chai tea I can post you as the sent me a couple fo the trial, it's unopened and still in it's wrapping. PM if you are interested and I will pop it in the post for you.