Dan's has Moet for $42.95 a bottle at the moment, this is about $10 off the normal special price, and up to about $20-30 off some other stores price. Dans usually fluctuates between 50 and 60 a bottle.
Also veuve cliquot for $51.95 a bottle!
Probably not for everyone, but this is the cheapest i've ever seen it, and trust me, i've looked!
edit: it appears for $44 on the online store, but select find in store > put in your postcode > then look at "store price"