Heritage auctions has some really nice chips up for auction. I wouldn't tell you about the auction but they are all out of my price range. Some are started at over high TCR value, some at half TCR so no telling. Just be careful with their outrageous buyers premium and shipping fees.
Here is a link to the first auction item -

http://historical.ha.com/itm/miscellaneous/gaming-chips/las-vegas-casinos-5-sands-hourglass-chip/a/6125-51102.s?type=wlem&wlc=360471365