Mark,
"Most" swizzle sticks will be worth about $1-$3. I'm not aware of a website for swizzles.

Mark Englebretson is setting up a fabulous website for NV casino ashtrays ! The site has pictures of many of the old casinos, historical information, and pictures of ashtrays with their values. BUT... if your ashtrays are very common, you won't find them on Mark's site. The site is not totally completed yet...but it's awesome! Click the link at the bottom of this post.

Also, the CCGTCC has a program called "Ask the Experts". Click this link http://www.ccgtcc.com/reference.html then click the 'ask the experts' link. It will take you to a list of experts who have offered to share their knowledge to help other club members.