Octane
Address: octane-magazine.com, Rating: 4/5
Not suitable for your average family hatch, but Octane magazine’s site is worth a look if you have a classic or performance car.
Listings are free, although it’s not purely Ferraris and Lambos – Mazda MX-5s and budget MGs are often here. Plus, there’s a database of buying guides, along with a dealer and auctioneer directory, spec list and more.