Here I have a fully refurbished and serviced Frog 52. It has 20 inch wheels, 8 gears and a bell! It’s just had brand new tyres, skewers, grips, bell, inner tubes and cables fitted so it’s running like new. Some marks on the bike from typical use. Any questions or queries just ask. Viewings welcome.
These bikes get a lot if good reviews and there are good reasons. Kids love them because they are so light and allow them to concentrate on riding rather than trying to control the weight of the bike. The pedals are positioned closer to the bike body so that the ride is more natural for kids.
They are well made and if you look after the bike it should still keep it’s value and can be resold once it’s too small for your kids.
Definitely worth paying that but more.
On the other hand there are other good kids bike that will cost a lot less. Look for Isla bikes or Carrera bikes.