I've been checking daily throughout August for updates on the Upcoming page, but now the Core Set has vanished from that page and still says Out of Stock in the Shop. Any idea of anywhere to get some more real time information? Especially since the RSS feed link didn't seem to want to work.

No, it's there, but it's still "in development" (?), which means it hasn't even been sent to the printer yet! (That can't be right?) Anyway, if you need it now, there are still some for sale on Amazon ($35 with free shipping, last time I looked).

People on BGG have reported seeing them restocked in the FLGSs.

My FLGS got a restock last Friday so you should definitely check and not go by what the website is saying

Also coolstuffinc.com has stock in. I was able to pick up a couple cores the other day at least.

I'm having a hard time finding this in Canada, Ontario.

Amazon.ca is selling it for $60+

Amazon.com and any other US vendor are charging $20+ for shipping.

Any body have any suggestions?

I have a standing order with my FLGS, but didn't want to bug them if there was still none to be had...