I make my own concentrate and refrigerate it for quick chai lattes.
I put 3 c. water, 2/3 c. sucanat, 2 t. vanilla in a mason jar the microwave til the sugar was dissolved. I added about 2 T. of raw honey to the hot water and then steeped four Tazo organic chai tea bags. Voila, just like the boxed stuff. Use it just like the concentrate and mix 1/2 c. milk & 1/2 c. tea (or however much you want, I guess).
Actually, now I think I need to go make some.