An “installment sale” is a contract for sale of goods under which the buyer pays for the purchased goods over a period of time through a set number of installments. Related entries Vinculum Juris Integration Clause Illusory Promise Penal Damages Indemnity Clause Lack of Consideration vs. Failure of Consideration Accord and Satisfaction Chance Bargain Insurable Interest Groves v. John Wunder Co.