Everyone who has had the site bookmarked for a while will have this problem. Cori switched recently to a www2 prefix for their website address.
Go to your bookmark for Cori, right click it, click "Properties," and where you see the web address, just stick a '2' between the 3rd 'w' and the dot.
That, or just delete the old bookmark and surf to the new site's address, and create the bookmark anew once you're there.
Or just stop shopping for Cori, particularly if you're the person who snatched up all twenty shops within 45 minutes of my home that finally would have been back in my rotation this month. And you took them on day 2, after only one increase. Which means next month they'll be low for me, even when I take them towards the middle of June when you still can't get them, but which is when I'll HAVE to take them just so you can't. And in July they'll be even lower for you on day 2 than they were this month on day 2 because I had to take them lower than their max in June since it's clear that I can't trust you to let me have a turn.
So, yeah, everyone except for the price-killing shop snatcher in my backyard, go ahead and change your bookmark and everything will be fine.