Type of USB? Haven't a clue on that one. I'm already working with one gentleman who got a Belkin, and after he got his COM port issue straight, he's up and running.
Software - I find I like BCTool better than FreeScan for 396 support. There's some things that BCTool has, that FreeScan does not, that are important for digital decoding (watch this, Assaf will write back and ask me about this...). I know Assaf is about to release a new version of FreeScan in the next week or two...here's BCTool's URL - and be sure to get the latest beta...
http://www.bctool.org/
Where to buy? Do your homework, Howard. Hobby Radio Shop's cash price is USD480...I don't think Scanner Master will match that...
http://www.bearcat1.com/Bearcat/item0047.htm
I bought mine when they were at the BRATS hamfest - no problem. Before I forget, tell them to keep their Mr. Scanner and Scancat software - it's junk, pure and simple. The data here on RR and BCTool are far and away better. Better supported, too.
Be sure to capture the Easier to Read manual for the 396 (it's linked in the wiki...) and start considering how you want to allocate your systems. The 396 Yahoo group has Excel-based worksheets, and I think the Uniden website has some as well (no doubt others have them...)
73 Mike