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Just to slightly clarify, the “BK” prefix, or lack thereof, is the manufacturer’s code for large quantity (“BK”) or small quantity boxes (no “BK” in part number) that they ship to us (Digikey) for the same part. As one might expect, the large quantity box is cheaper per unit for us, and that lower cost for us is reflected in the lower unit resale price we show.
In either case, as @Justen_Lee states, a unit quantity of “1” will get you one single fuse block.