Try the link provided by JimmyR. as well as look at
http://www.gunbroker.com.
I bought a Wanad P-83 recently and even tho it functions and works fine I ordered a spring kit from
http://www.buymilsurp.com/ just to have in case.
I operate under the "well it may be not broken now or ever but...." & "plenty of parts available now but.....ex. 3 yrs. from now" meaning I have spare parts for all of my firearms packed away in oily bags.
As parts like spring kits and small parts like hammers, extractors, etc... are relatively inexpensive depending on the firearm if you have the money and room for parts buy them.