Yes, silver buttons are quite pricey. Pewter might give you a richer look without fear of plate rubbing off. Here are some sources at three different price points. I don't have experience/connections with any of these companies.

Moosedog

http://www.ramshornstudio.com/retail/en-us/dept_20.html

http://www.faireware.com/button1.html

http://www.landofodds.com/servlet/Ca...BUTTONS+PEWTER