The Treasure Bay MS Grand Opening $5 most recently sold for $5 on ebay. Chip was originally listed for $5.50, didn't receive any bids, was relisted and sold for $5. Chip doesn't look mint.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3213644843&category=899

Couldn't find a Grand Casino recently listed on ebay but it sells (normally) $7-$8.