I have been using a wonderful one by Oskia (Get up and Glow)
I got it for free from a friend who works for a magazine and love love love it! But it's running out. So imagine my surprise when I had a look to see how much it cost... 
So, back to the drawing board with much sadness. I need this magic potion in my life dammit!
There has to be a cheaper alternative surely!??