I’m at the bargain end for my kids. Last one was a Carrera Blast 20″ for £60 off FB, she’s now outgrown so picked up a tatty 24″ Abyss for £15! New wheels, gears & paint job it’ll cost me about £120 all in.
They outgrown them too fast to spend loads and they get handed down to #2 and it doesn’t feel like #1 gets a new bike all the time.