I went with Amazon's listing which was $609 & about $6 shipping for the least expensive one listed...Remember this is for the Nikon 19-24 that the poster recommended, not some other UWA.... I paid $350 for my Sigma 10-20 F4-5.6 used in mint condition on eBay complete with all the accessories...
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Gifted One wrote:
Scott, I have a bit of a quibble with you on the used pricing. I am a Canon guy, but lots of that glass around at side-walk pricing. OP just need to take a long hard look, or through cash.
J. R.