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Ground penetrating radar (GPR) is a nondestructive tool for investigating the subsurface. When used in laboratory testing, large boxes to contain the test specimen aggregate or soil are necessary. However, boxes created for GPR testing have some unique requirements such that they do not interfere with the sensitive GPR equipment. This paper presents the design and construction of economical boxes for GPR testing. Key design requirements for this test box were: minimal use of metal, compatible with a wide frequency range from 300 MHz to 1.6 GHz, capable of specimen saturation, capable of efficiently breaking down the specimen, and can be used for the preparation of hundreds of test specimens.. The literature does not contain many examples of test setups that would fulfill these objectives nor does it include specific instructions on how to create a box to achieve them. This paper presents the final economical design for laboratory testing of aggregate using GPR.