On many mornings since starting work at Marshall University I've made a small pilgrimage to Starbucks to get an Earl Gray Latte - it's Earl Gray tea, frothy milk, and some vanilla shots... It's pretty tasty.  I've spent way too much money on them though - they are $3.85 per medium  (16oz) after tax!
Today I didn't make that trip.  Instead I attempted to make my own with my new Capresso Froth Plus machine, my hot water heater, my own vanilla, and a tea bag.  It worked out pretty damn well.  The Capresso Froth Plus machine kicked ass (though it is a little noisy), the vanilla is the same that Starbucks uses, and the tea is also a Tazo tea (though I used "Awake" intead of Earl Gray as that is all I had on hand).

Here is the breakdown for me to make a 24 ounce cup:
1 bottle of Torani Vanilla Syrup - $15.50 (free shipping).  3 pumps = 3/4 oz.  That means I get about 33 servings per bottle - so it costs me $0.45 in syrup.
I can buy 120 teabags of Tazo Earl Gray for $28.32 which works out to $0.24/bag.  More than I expected but not too bad.
I bought a small 1 quart bottle of milk.  There are 32 oz in a quart and I used, I think, 4 oz.  A quart costs $1.50 I think so $0.19 for the milk.
That makes my single 24 oz cup of tea cost $0.88/cup.  For a savings of just under $3/cup plus I get an additional 8 oz.  If I were buying the larger cup at Starbucks it would cost me around $4.15.
The Capresso Froth Plus is kind of pricey; it cost $52.53.  Saving $3/cup means that I will have paid for the frother (vs going to Starbucks) after making just 18 cups of tea.  That's just over 3 work weeks of tea when drinking a single cup per day (I usually have two on Tuesdays due to my late class so it will be exactly three work weeks for me).
That's not too bad plus, I'm reusing my mug (a great mug I was gifted by my mother).