East African baboons, and the genus that contains the orange baboon tarantula, which the hobby has affectionately nicknamed the orange bitey thing for reasons every keeper eventually understands.
P. murinus comes in colour forms: RCF for the orange, DCF for the dark brown, TCF, plus the Usambara locality label that gets applied loosely. Those forms are the same species and the price differences between them are pure aesthetics, which is worth knowing before paying a premium for a label.
They are fast, defensive, will threat posture at the sight of a tongs, and their venom is unpleasant. They also web heavily, grow quickly, cost almost nothing, and are genuinely rewarding once you stop trying to interact with them. Supply is enormous because they breed like they are being paid to. This is the least expensive way to own a real old world.