That 50% off is a fallacy. Well, around here at least.
Sunday Ads in newspapers are area specific.
Neither Office Max -or- Office Depot have WD on sale. They hardly carry WD as is. This is true for the store on Eggert (OD next to Mighty) and the OM on Maple & Sweet home.
Overall these drives should start getting cheap fast… the 750 gb internal HDD has been out long enough.