The Inventor's Kit Parts Refill Pack includes new items such as servos, gearmotors, photocells, and mutli-colored buttons and LEDs. We understand that sometimes you need to replace some more pricey parts, we hope this helps!
Sonoff SC is a great environmental monitoring tool that can measure current temperature, humidity, light intensity, air quality, and sound levels. The environmental values can work as smart trigger conditions for other Sonoff devices.
Arduberry works with Arduino & the Raspberry Pi, a powerful little computer. It allows you to access lower level functions on Arduino shields for more precise control.