They would have to collect sales tax (in those states that have a sales tax) unless the online retailer was a wholly independent entity (which it isn't..so the point is moot). If you go through the motions of putting together an order @ tmo's site, you'll see for yourself.

With the current recession and the strained coffers at the state and local levels that it has brought, you can bet that the gov't bean counters will be watching such high-profile retailers like tmo and friends like a hawk when it comes to collecting the taxes due