Jamieson, Fausset and Brown on Judges 17:3

3. a graven image and a molten image--The one carved from a block of wood or stone, to be plated over with silver; the other, a figure formed of the solid metal cast into a mould. It is observable, however, that only two hundred shekels were given to the founder. Probably the expense of making two such figures of silver, with their appurtenances (pedestals, bases, &c.), might easily cost, in those days, two hundred shekels, which (at 2 shillings, 4 pence each, is about 23 pounds) would be a sum not adequate to the formation of large statues [Taylor, Fragments].