If you had the $$$, you could get one now.
here is a list of aftermarket conversions to convert a Prius into a PHEV. Not cheap...yet
Prius PHEV - EAA-PHEV
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1953 Cadillac Coupe De Ville (Fuel Injected, Drive-by-wire, DoD)
2009 Pontiac G8 GT (6.0l V8 Sleeper)
2011 Toyota Sequoia Sport 4x4 (Tow Rig)
My Blog:
www.HotRodCaddy.com