Posting for a friend (jamesjr4750 on TundraSolutions forum). Long story short, I bought a kit from him a few years ago for my 100-series but never installed it - found James to be a super helpful, responsive and honest person to deal with).
www.tundrasolutions.com
If you want one installed and you are in the North West, I'd recommend having him do the install - this guy knows a TON about these superchargers and engines.

FOUND: TRD 4.7L Superchargers FOR SALE
For anyone who wants these elusive superchargers, Here are a few: 1.) TRD Supercharger 4.7L Toyota V8 | Fort Worth | eBay Classifieds (Kijiji) | 2737154 2.) TRD 4.7L V8 Supercharger '03-'04 Tundra/Sequoia | Knoxville | eBay Classifieds (Kijiji) | 2630798
If you want one installed and you are in the North West, I'd recommend having him do the install - this guy knows a TON about these superchargers and engines.