Is there a good shampoo thats not too expensive that helps make hair straight and not greasy?

my hair is straight, but after a shower it gets this really ugly wave to it unless i blow dry it, and i dont always feel like blowdrying. my hair also gets greasy pretty fast.Is there a good shampoo thats not too expensive that helps make hair straight and not greasy?
Nexxus has a good line. Not too expensive. They do have a spray called STRAIGHT MEMORY. It is good. Your Spray in while wet, than straighten as you normally would. It may take a week or more to see results, but using it everytime you wet your hair will help.





Nexxus is a good line for straightening hair.