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Bindings are like cars. Once you buy them new, their resale value drops quickly. I wouldn't pay anymore than $300 for px18s. End of the year deals on PX15s go for $170-$220. New PX18s at the end of the year are around $300.
My bad. The PX18 is a derivative of the P18. Originally, it was the P18 with a wider brake. Even so, no one in their right mind would pay more than $250 for used P18s.
Use this page to gauge my response. The guy is selling ZR18s and he's right, ZR18s are the same solid construction as a P18 with a different toe piece. http://www.epicski.com/forum/thread/80262/subject-high-din-binding-sale-look-p18-look-p14-3-look-zr18-marker-comp-1800-3-marker-comp-1400