Here is an article on this years restaurant prices and some retail fish outlets in Punta del Este.
Some restaurants have a " cubierto" which is a cover charge per person and in some, if they accept credit cards, you can get a discount of 18% on the tax if you use an overseas card.
Prices are in pesos.
http://www.tvshow.com.uy/gatos-merodean-puerto-punta-este.html