The online Casino Ashtrays site you're thinking of is:
http://www.nevadacasinoashtrays.org
HOWEVER, the site says "temporarily down due to excessive hacking attempts".
There may be an archive of the site elsewhere, but I don't know where to look.

Also, there's an archive article on ashtrays by Mark E. He's the one who created the nevadacasinoashtrays.org page originally. See:
http://www.ccgtcc-ccn.com/Ashtrays.pdf

As to guides for ashtrays and casino playing cards, check out the "Books" listings that's on the MoGH website here:
http://chipguide.themogh.org/cg_books.php

Specifically...
For Ashtrays --
Casinos and their Ashtrays, by Art Anderson
Casino Ashtrays, by Roxie & Gary Held

For Playing Cards --
Playing Card Guide (series 1 thru 5), by Janice O'Neal & Sandi Steffner
Nevada Casino Playing Card Guide Addendum, by Jim & Sandi Steffner

There may be other books out there, not on this list. Also, unfortunately most or all of the above books are rather dated, so the price ranges may not be too helpful, except on a relative basis.

There's some starting points for you. Good luck.