My hair is so oily!!

[lldm2]

I just straightened my hair a week and a day ago... but my hair is REALLY oily and gross =/.
I don't want to wash it because I want to have it straight until at least Halloween and I really don't feel like re-doing it.
What can I do to make it less oily without making it turn curly?

[MBCurlyGirl]

When my hair gets too oily, I sprinkle a small amount of cornstarch in it, then brush it through with a boar bristle brush. It works like a charm!

[tanishagurl]

baby powder work too if you dont want to use cornstarch!