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Maybe that's because people that work in the "big box stores" are not well versed in plumbing terms.
We call them "boiler drains" and keep them in stock in both 3/4" MIP to use for water heater drain valves and 1/2 MIP versions for laundry washing machine valves. We buy our inventory from plumbing wholesale houses but I would think most people that work in a real hardware store will know what a "boiler drain is.
The problem sometimes is that they aren't long enough to reach through the water heater jacket/insulation so we use a 3/4" angle female sill cock with a brass nipple instead.
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