Jumping spiders, and the reason a whole parallel hobby exists next to the tarantula one. P. regius, the regal jumper, is the flagship.
Everything about keeping them is different. They are diurnal, visually driven, and will track you across a room and watch you back, which nothing in Theraphosidae does. They also live about a year. That short lifespan is the central fact and it needs to be said plainly rather than buried, because keepers coming from tarantulas are used to decades.
Turnover is high, and the market is seasonal in a way the tarantula market is not, because much of the supply is wild-caught or descended from wild-caught adults collected in the warm months. Expect availability to swing with the calendar and color morphs to carry real premiums.