".50BMG ball cartridges - a dumb lump of lead wrapped in a cupro-nickel jacket - cost about £3 each in Blighty. Vulture Central's backroom gremlins imagine a self-steering smart .50" round would easily cost double or triple that."
£9 for a steerable bullet? Your gremlins need to get out more.
I'd say 3000 times that (£3 that is), and still wondering if I should've added another zero.