8. The Never Ending Slinky Machine
Price: £50 If you already own multiple Newton's cradles and several varieties of stress balls, then the Never Ending Slinky Machine could be for you. Designed to keep a slinky in perpertual motion, the NESM is just about the ultimate toy for any slinky fanatic. The machine can be powered by USB, and can keep a slinky tumbling throughout your working day. While 50 quid is a lot to spend on something that plays with your toys for you, it's also not a bank breaker if you know a child (young or old) that has a fascination with spring-based objects. https://www.youtube.com/watch?v=B1CzmvXTzW0