First Robots Ages 8+ · $27–$39
The easy on-ramp — a 30-minute solar build and a robot that works right out of the box. (Heads up: OWI doesn't make kits rated under 8.)
Transformers X-in-1 kits · $75–$125
The multi-build kits — one box, many robots. These are the heart of the store.
Master Builds Ages 10+ · $49–$67
The challenge tier — a working mechanical hand and a 100-experiment electronics lab.