I'm still digging through the rest of the stuff brought back from the convention and just added over 200 room keys to my store on Delcampe, some regular hotels but mostly casino. Newest additions are listed first:
https://www.delcampe.net/en_GB/collectables/search?seller_ids%5B0%5D=554914&categories%5B0%5D=20169

If you see anything of interest, we can deal direct if you don't have a Delcampe account.

There's over 1,200 room key cards currently listed and well over 12,000 slot cards with new additions every few days
https://www.delcampe.net/en_GB/collectables/search?seller_ids%5B0%5D=554914&categories%5B0%5D=20485

If you're looking for anything specific I can generate custom searches and email a link to the search results.