no you don't pay GA sales tax
Yes. Tennessee levies a use tax (at the same rate as the state sales tax) on large purchases from other states. You can arrange to have the dealer compute your tax and wrap it into the purchase price or you can pay the tax separately in Tennessee.
You can buy any diesel truck in Tennessee from any auto dealer that focuses on selling trucks. Diesel trucks are very common nowadays and most dealers will carry these types of models.
Yes- but only from a dealer. You may not buy a firearm from a private seller in ANY state other than your own.
You can buy a John Deere tractor in Memphis, Tennessee at the local tractor dealer. Since Memphis, Tennessee is located in the south, it will be very easy to locate a John Deere.
where do you live? you can buy it in any Lexus dealer.
As many as he can afford to buy.
You pay taxes to your home state regardless of where you buy the vehicle. A dealer can handle that for you, or you go to the courthouse.
You can
"You may purchase a used MPV at a Mazda dealer. Depending on the dealer itself, you may buy a variety of used and new vehicles to comply with your needs."
One can buy a used 2001 Mitsubishi Eclipse from several places. One can buy from a local Mitsubishi dealer, and that is probably the best source. One could also check a general used car dealer.
To legally purchase a handgun out of state, you must have an FFL dealer ship the handgun to an FFL dealer in your state.
From a reputable used car parts dealer.