Hair Product Suggestions

Hi everyone!
Bit of a random post, but could anyone recommend a good leave in hair treatment which isn't too expensive?
I have my birthday, my graduation and my graduation ball coming up in the next few weeks and I want my hair to look as good as possible!
I've tried Aussie products but they don't really seem to work for me, so is there anything else any of you could suggest? I'm open to trying anything!
Thankyou!!!