Tommee Tippee GroEgg2 room thermometer and night light

The egg shaped nursery thermometer that glows yellow when the room is the right temperature and changes colour when it is too hot or cold, doubling as a gentle night light. It is the number one seller in children's lighting on Amazon, and 10,000 people bought one in the past month. Amazon has it at £19.98 against a £32.99 RRP; Boots was out of stock online and no other high street price could be read today, so this one is a was and now deal.

Cheapest right now: Amazon, £19.98