Small North American scorpions including P. spinigerus, the stripe-tailed scorpion, which is one of the most abundant species in Arizona and one of the least expensive scorpions anyone sells.
Mild venom, arid setup, burrowing or sheltering under surface debris, and undemanding. A reasonable first scorpion and often recommended as one, though it is small enough that some keepers find it underwhelming.
Wild-collected in volume during the warm months, so prices sit at the absolute floor and supply disappears in winter. Nobody breeds these commercially because collection is trivially easy. The market will stay accessible and stay seasonal, and there is no scenario in which that changes.