Unless you find the deal of the century, you're not going to buy a blower, and have it running for under a grand. Hell, the tune is $350ish for a supercharged car alone. Fuel pump isn't cheap, neither are injectors.
$1800ish is about the cheapest I think (using used parts) that you can get a supercharger and get the car running correctly and tuned that I've ever seen. Typically it's around $2500 by the time all is said and done.
2001 Dark Highland Green Bullitt
12.25@110 naturally aspirated on a bone stock 2V longblock
Under Reconstruction for RS275 Drag Radial Class
Pushrods and Powerglide Coming Soon
If it weren't for physics and law enforcement, I'd be unstoppable.