As for the tax, its not the dealer that pays the tax, it's you. Most tiiles have a place where the sales price is written. If not then you have a bill of sale that does. You take this to your state DMV and pay the sales tax in your state at the time of title transfer. I've bought 5 cars out of state (4 on E-bay) piece of cake.

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1959 Gravely LI, 1963 Gravely L8, 1973 Gravely C12
1982 380SL
1978 450 SEL 6.9 euro restoration at 63% and climbing
1987 300 D
2005 CDI European Delivery
2006 CDI Handed down to daughter
2007 GL CDI. Wifes