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If it wasn't for a lack of mountains and salt water I might move to Oklahoma. Here in the People's Republic of Washington, sales tax is 8.7% and the annual registration fee is $65.

Just make sure you don't end up in Kansas. Here, sales tax is 7.45% but the killer is the property tax, $950/yr on a $20K airplane; and if you overhaul the engine, they bump up the value of the plane and tax you more.

[Linked Image from visitedstatesmap.com]