A few on ebay like this; Just use magsafe, car adapter, DC, etc as keywords.
http://www.ebay.com/itm/MagSafe-Car-Charger-Adapter-85W-for-Apple-Macbook-Pro-15-17-15-inch-17-inch-/271016596468?pt=Laptop_Adapters_Chargers&hash=item3f19d913f4
I've bought a couple. I do have the hypermac one, but it needs a magsafe attachment as Hypermac doesn't supply one, so haven't used it yet. There are various types on ebay. I haven't tried the one i've posted but the other types i've bought worked ok. I wouldn't use it while the engine is not running.
Cool and that one will work fine with my late 2011 15" MBP?
Is there one available or do I just get an inverter.
Any suggestions and or links please so I can use it in my car with out it going flat.
Thanks