2000 Chevy Blazer vibration on front end

My 2000 Chevy Blazer is vibrating in the front end very badly. It is so loud. I thought it might be the tires, but I tried the spare and it still was vibrating. The sound is coming from the drivers side. There didn't apear to be anything loose or missing when I pulled the wheel. Brakes looked fine and nothing appeared to be busted. The sound is so unbearable it gives me a headache and the thought of having to dump any more money into this vehicle is giving me nightmares! Is there any way to get this repair done on the cheap?