I never pay sales tax (or buy at retail stores) on big ticket items if I can get them for the same price or less online, without tax. 8.3% off my $3000+ order is nothing to sneeze at!
You do know this is tax fraud, right? Unless I'm mistaken, every state that has a sales tax requires you to pay these taxes at the end of the year on your return if you didn't pay at the time of purchase.
Just sayin'. Do what you want to screw your fellow citizens, I suppose, but I wouldn't go around bragging about committing a crime.