Henadic Theologian
Legend

D&D books like Phandelver and Below are getting big price cuts
Adventures both new and old enjoy discounts of up to 70%

I'll do some research to find out if Canada is benifiting from this price cut.
That sounds pretty normal really, happens all the time, including new books selling for 25% less. That was true for Bigby as well
Purely anecdotal: Van Richten's might've been over-produced as a response to the popularity of Curse of Strahd. It hasn't been uncommon to see 10+ copies of it sitting on the shelf of my FLGS for two years after its release. (In comparison, other books have 1-3 copies on the shelf.)Spelljammer has a pretty big discount at 45% off, as does the Rules Expansion (Tasha's, Xanathar's, Monsters of the Multiverse) at 60% off. The latter I suspect is because the current edition is seen as outgoing. But I think the biggest discounted book (and has been for some time) is Van Richten's Guide to Ravenloft at 66% off. Baffling, as I didn't find VRGtR to be bad and it's got good reviews, but to have that much of a discount sure seems a lot of people must have passed on it.
saw it for $42 or so a few weeks before release (Amazon US), of course if you preorder you get the lowest price it had before releaseNo deal on Bigsby's here in Canada, and still can't preorder Planescape from Amazon.
Shame those discounts aren't for the Alt covers.
Oh I know that. I frequently get my Alt Cover DND books from either Minature Market or GameNerdz.There are large brick & mortar stores that also have a large presence online and often they have the alt cover versions in their online stores for a discount, at least until they sell out. For example, Miniature Market has both the normal and alt cover versions of Bigby's for $48 right now.