$300 sounds about right. You can also check eBay for good deals, they come up every once in a while - make sure to search several times with various combinations of the words. Also, if you have any friends into imports, you can ask them - often some guy will sell his barely-used Tanabe because he wants a 5Zigen, or is selling the car, going to jail, who knows, etc.
But it's very possible to do it on a budget!