There are many places to search for and find American pony and muscle cars for sale. An auto enthusiast can spend some real quality time on the hunt via the internet. Sites like eBay Motors, Craigslist, Maple Motors, Beverly Hills Car Club, OfferUp, Facebook marketplace, Autotrader Classics, Hemmings Motor News, Mecum Auctions, Barrett-Jackson, RM Sotheby's, Bring A Trailer, etc. come to mind in a flash.