"A golden tarn disk was a small fortune. It would buy one of the great birds themselves, or as many as five slave girls."
(Tarnsman of Gor - p. 91)

"...Several of the men about, striking their shoulders in the Gorean fashion, applauded the merchant. He had been very generous. A silver tarsk is, to most Goreans, a coin of considerable value. In most exchanges it is valued at a hundred copper tarsks, each of which valued, commonly, at some ten to twenty tarsk bits. Ten silver tarsks, usually, is regarded as the equivalent of one gold piece, of one of the high cities. To be sure, there is little standardization in these matters, for much depends on the actual weights of the coins and the quantities of precious metals, certified by the municipal stamps, contained in the coins. Sometimes, too, coins are split and shaved. Further, the debasing of coinage is not unknown. Scales, and rumors, it seems, are often used by coin merchants. One of the central coins on Gor is the golden tarn disk of Ar, against which many cities standardize their own gold piece. Other generally respected coins on Gor tend to be the silver tarsk of Tharna, the golden tarn disk of Ko-ro-ba, the golden tarn of Port Kar, the latter particularly on the western Vosk, in the Tamber Gulf region, and a few hundred pasangs to the north and south of the Vosk's delta.
(Rogue of Gor p. 155)

For purposes of comparison, in many paga taverns, one may have paga and food, and a girl for the alcove, if one wants, for a single copper tarsk. Dancers, to be sure, sometimes cost two."
(Renegades of Gor pp. 51-52)