Caribbean giants out of Cuba and Hispaniola. Big, fast growing, permanently hungry, and blue as slings on several species before that color fades into bronze or purple sheen.
They grow faster than almost anything else their size. A well-fed sling can be a five-inch spider in under two years, which is genuinely unusual and makes them satisfying if you dislike waiting. They are also bold, defensive, and take prey with a violence that surprises people.
Cuban export is nonexistent, so the market runs entirely on captive breeding from long-established lines. Prices sit in the middle of the range and stay stable. The sling blue phase drives a lot of impulse buying, and there is a predictable pattern of resale listings from people who bought the blue and got a large brown spider with an appetite.