I second younggun2.0., however, I found a better blaster at Northern Tool, around $50.00 complete. They also have the best prices on blast glass, about $9.00 per 50lb bag. You won't find those prices anywhere else, and blast glass doesn't heat up the metal like sand does, so warping isn't an issue. And don't forget the kitchen strainer to set atop the blasting hopper, sweep that stuff up and use it over and over again. One 50lb bag can last a long, long time.
http://brewerscustomcars.com/2012/2012-4-24/2012-4-24.html
Buy cheap glasses, as you'll go through em, they'll scratch real quick-like under that car. Harbor Freight has glasses for around $2.00 per pair, grab 10. And don't forget the masks and a ball cap. That's it, you'll save hundreds.
I have a 35 gallon 6 hp compressor, not quite enough, but it did the job. With that size compressor, you'll get about 2 minutes of good blast time, then have to wait 4 or 5 minutes. With a bigger compressor you can go nuts under there.
My cheap glass blaster from Northern Tool was probably the best damn tool I purchased in restoring my 67 Barracuda.