WTB - 195 or 205 /50/15 Autocross Tires

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Hi All, Just wanted to see if there was a set of good used tires availble in the 195 or 205 50/15 sizes that would be good for autcross when not on purple crack. Specifically looking for some Dunlop Z2's or Hankook RS-3's with the treadwear >200 so I can use them next year too. Would like to have better than 50% life left and not be too old. And of course cheaper is always good :-).

Thanks,

Michael