Was surprised this wasn't here already. The sale (and store) was meant to end today, but they've decided to extend it a week (I was told this in store, I'm sure they'll get around to mentioning this on their Facebook page at some point tomorrow).
At the moment most of the stuff I checked was about maybe 10% below the price online elsewhere, some of it about the same. I'd hope the discounts will increase towards the end though.
Some highlights off the top of my head are:
Munchkin games at $20 or less
Magic the Gathering Adaptive Enchantment & Natures Vengeance Commander Decks. $45
Coup : Rebellion under $25
The store has 3 rooms, the front room is 25% off, The right room and the back room are up to 80% off (I don't think i noticed anything quite that discounted). The exact discounts for each item aren't displayed anywhere though, so for you have to ask the guy at the counter who seems to be arbitrarily applying whatever discount he feels like at least some of the time. Also Epping was the place where good games would dump all their old stock and brand it as "factory outlet" and this consists of the bulk of 80% off areas, that stuff had already been heavily discounted for sometime beforehand.
TLDR; temper expectations.
EDIT: In Store only
Do they have Snakes & Ladders?