Como eu digo em portuguese, Your price is too high

When shopping in the small shops in Centro, Jundiai I have often wanted to tell a person that their price on an item was to high, but did not know how to say "Your (or the) price is to high." In other words I would like to be able to "dicker" or bargain for an item, without insulting the shopkeeper. Dicker (ingles), nao confundir com Cintina Dicker, muito linda modelo, Rio Grande do Sul).

Dicker = Bargaining = Pechinchar

Obrigado por sua ajuda.