2nd hand tyres

I am currently in need of new front and rear tyres and i'm planning to go for the 2nd hand "ex-race" sort.
I've seen them around for about $200-$250 per set..but in this post dan said you can even get them for 160? (80 each)
http://www.ksrc-au.com/phpBB2/viewtopic ... light=tyre
So just wondering if anyone has had any experience with going for 2nd hand tires for the road..and dan if you could please tell me where you can get $80 tyres!!
thanks guys
I've seen them around for about $200-$250 per set..but in this post dan said you can even get them for 160? (80 each)
http://www.ksrc-au.com/phpBB2/viewtopic ... light=tyre
So just wondering if anyone has had any experience with going for 2nd hand tires for the road..and dan if you could please tell me where you can get $80 tyres!!

thanks guys