I have to agree with Grizz, buy a pair of ST-290's, figure you'll get 6 months to a year out of it. By the time they are dead you should have been able to save enough to buy a CH stick.
Whats more I would strongly encourage anyone to find a way to "mount" that stick, be it temporary or permanent.
Put it at a comfortable level to your arm when your sitting back. Ideally so you can brace your elbow to give you finer control.
Mod your chair, your desk, build up the base from the floor, there are many ways of doing it.
All of them give you better control than just having it sit on the desk.