The cheaper way is to either use shucked EasyStores when they’re on sale or to buy them from ServerPartsDeals or whatever the site is called.
I got some 18TB drives for $200 from them. With EasyStores, 14TB drives are about the same price. The 18TB drives are refurbed and come with a shorter warranty, but you have to be rather careful with the EasyStores to maintain the warranty and you’ll still likely lose it.