I bought one recently in the UK - cheapest plastic ones were too flimsy (last couple of kettles died from broken plastic parts [eg in over-complicated lid catches]). Metal ones at the next level up didn't have a level indicator to see how full it is without opening the lid. Next level up from that was about £25-30.

IIRC we paid ~£25 after discount. The best value, of those I found, excluding aesthetics was ~£22 .

They are cheap in Australia as well since so many people drink tea. I had a $10 one which lasted for years.