According to the creator of the Vinny app for the Apple iPhone, Alexander Kiss, "Dealers really prey on consumers." The app shows an estimated wholesale price for a car based on previous transactions, and the condition, mileage and age of the car. Having this information in hand can help you save money when negotiating with a used car dealer. Kiss says, "For example, if a dealer has a $10,000 sticker price on the car, we can show you that the wholesale price on that car is $8,000 and that there's some negotiating room." In addition, the free app also includes prices from the Kelly Blue Book and other sources including similar cars sold on eBay.
Another app, Snafu Scan, also provides the wholesale price of used cars, accurate to $100-$300. Unlike the Vinny app, this app will require you to lay out some money with a $9.99 30-day subscription. Besides wholesale prices, Snafu Scan will enlighten you on tricks that dealers use to cover faulty air conditioners or head gaskets. Unlike Vinny, Snafu Scan is also available from the Google Play Store.
source: Vinny, SnafuScan via Reuters