WTB: old specialized/hed trispoke

Hey all. As a road cyclist just starting to dip my feet into TT/triathlon, I've been curious to try the much-ballyhooed Specialized Trispoke/HED3. I'm (understandably, I hope) not looking to splash $750 for a new one, so I was wondering if anyone might have an old one around that's no longer seeing use. I'd really appreciate it. Tubular or clincher is ok.

Also would be open to Zipp (404 or deeper), Corima 4-spoke, etc. Basically if you have race wheels on your hands that aren't seeing use anymore, I'd at least like to hear what you have.

Thanks

Dylan