From me they're free. However are they metal or plastic. I've looked through the bag of bits that came with my PC (they probably didn't know where they went:0) and there's some plastic things that look like standoffs. Doesn't really matter as I'll send both sets if you still want them, I'm just curious.
They don't look anything like that but the metal ones match the other standoffs in my PC. I've managed to get a photo of them (21kb) so if you want to have a look at both the metal and the plastic one then email me for the piccy.