Dan, call these guys in coombs:
http://www.demxx.com/
i was there 2 weeks ago, and thy had some nice slabs, still with the protective sheeld on it, it was 1 or 1 1/4 thick
When you call, thel them the slabs where in the back left shelter, standing straight up, thy had several sizes.
i cant find the paper, how much thy wanted for it, I wrote it down somewhere.
Cant hurt to call, and if thy have them still, have them send you pictures of it.
i do know thy come down to vic once a week or so.
There might be a good deal, also for 1/4 and 1/2 inch