Does that $320 L&M on ebay come from a dealer with a warranty, or is that just what they usually go for used?
Not sure where $280 comes from either. My TT was $110, and I ran it at first off a $15 SLA battery. I'm now using a $50 NiMH bottle battery, and their nice smart charger, so even that's only $210 or so with shipping.

That price is probably for their LiIon system or something. Wouldn't work for me since I use my lights quite often below zero F, where a LiIon would probably not work at all anyway.