Cost Price is a 1949 adventure novel by the English author Dornford Yates (Cecil William Mercer), the eighth and last in his 'Chandos' thriller series.

[2] With Austria threatened by the Anschluss, John and Olivia Ferrers ask Richard Chandos and Jonathan Mansel to help them recover the priceless jewel collection of the Borgia Pope Alexander VI that, at the end of Safe Custody, had been left in a walled-up chamber of Hohenems Castle in Carinthia.

Having extracted the gems, and briefly taken refuge in Wagensburg Castle (the scene of the action in Blind Corner), Chandos joins a group of strolling players led by Jasper and Colette, to help smuggle them over the border into Italy and eventually to England where they are destined for a museum.

Other characters from previous novels include the manservants Bell and Carson, Andrew Palin, and Jenny Chandos.

The book was published soon after Mercer had completed the building of a new house in Southern Rhodesia to which he and his wife had retired.