Alright, so I made a helpdesk ticket for this, but I guess posting it here as well won't hurt. I can no longer access the christmas sale page, even though the sale is supposed to run for two more days. I was planning on holding off on any purchases until now, to make sure I didn't overspend (what with december usually being an expensive month), so I hope this is fixed soon. :)
You are right, I just tried to access the Holiday Sale page myself and see that it isn't showing up for me either. I did go directly to product/store page, and it looks like the sale prices are still showing up there, if you can remember the games you were interested in.