Add-on products sold by car dealers, such as service contracts, Guaranteed Asset Protection (GAP) insurance, and window etching, make up a large share of dealers’ profits. They also significantly increase car buyers’ costs. While many have questioned the value of these products for consumers, the pricing of these products has received less attention, largely because pricing is not transparent. Even regulators lack information about what car buyers pay for these products. Dealers decide what to charge each consumer and generally only the dealer, the finance company, and the third party provider of the add-on ever know what other consumers are paying. This National Consumer Law Center analysis of a large national data set is a revealing first look at what dealers pay for auto add-on products and what they charge consumers.