I just want to flag this one, an arm aimed at students: the Braccio ++ kit, for an introduction to robotics, letting you lift, place, twist objects under digital control… Braccio means arm in Italian, ...

A mini robotic arm is now being sold for $600. While still a bit pricey at $600, Arduino's RP2040 powered Braccio ++ states that it is for educational purposes.