Dry shampoo is one of the best inventions ever. When you don't have time to wash your hair, or wake up half an hour late and suddenly look like you've just been swimming, it's a quick and easy solution.
Two of the best Dry Shampoos are Batiste and TRESemme. I have Batiste Original and it makes my hair look like it was washed just 24 hours ago. The Original version doesn't have a refreshing smell, but it's a great quick fix. I have never tried the TREsemme one but it is rated as one of the best and although doesn't have a great smell is said to really add volume to your hair.
The Batiste Original 200ml can be bought for £2.99 and lasts a very long time! The TREseeme 200ml costs £4.79 which is more expensive, but several reviews quote it as "better than Batiste"
In conclusion, i think that the Batiste dry shampoo is perfect on a budget as it cleans your hair and takes less than ten minutes to apply and brush out. I personnally prefer this to TREsemme as although this has a better smell, it is much more expensive for the same size, same quality bottle.