Goot, I know how you feel. Last year we bought a house on sept. 27, christmas dec. 25, was married dec. 27, wifes birthday was jan. 4, valentines day feb. 14 and my birthday feb. 27. Talking about flat out broke.
Do something like buy her a yellow rose instead of red and explain you gave her yellow because not only do you love her but she is your best friend. If she isn't lie and say she is anyways. Cheap and easy go to a movie or teach her how to play cs.
I am from the south so the best thing you could do is buy a six pack and watch the daytona 500 with her.