Chip Exchange just listed a bunch of chips at BIN or BO - I'm still trying to figure out what I'd do with Casablanca $500's, but they look good
https://www.ebay.com/sch/thechipexchange/m.html?_nkw=&_armrs=1&_ipg=&_from=
https://www.ebay.com/sch/thechipexchange/m.html?_nkw=&_armrs=1&_ipg=&_from=