I only drink tea occasionally, but I've been happy with The Republic of Tea brand. Right now I have the Orange Spice Green Tea flavor and it's delicious, but I don't think it's caffiene free. Their website lists all the flavors they have that are caffiene free

www.republicoftea.com

I'm not sure where you are located, but Cost Plus World Market carries a good selection of tea. I always enjoy going there and finding something new.