Oh man, that sucks.
How small are the broken pieces? You still might be able to fix them. Use a larger piece of hobby plastic as a substrate, then glue the broken pieces back together like a puzzle. If they're screw standoffs, you could sort of glue the post back together, then fill it with epoxy resin. Then buy a cheap thread tapper to make new threads (or self tapping screw of the same threading ... which might be more difficult and might not be any cheaper.)