You don't really have to spend money... or at least not a lot. Think about your girl and do something special that she will like. It doesn't always have to include cash (well... some women are like that and they need a wakeup call).
Hell, I'd be thrilled if Jason brought me to test drive cars all day or if we were to swap my transmission into my car.
<-- cheap date.
I don't understand this whole, "bring me to an expensive restaurant, buy me chocolates and lingerie (okay... I do understand the panties and such because she'll put them on and you'll take them off) and jewelry" deal. I think it's cool to just put the day aside for the two of you. A movie in, curled up on the couch together, maybe make dinner. Sure, that can cost money, but it doesn't have to cost a lot. It's more the effort or attention to detail that gets to me than how much is spent on me.