By “new” do you mean used or refurb machines? Desktops/Laptops with official support can be had as low as £100 (although typically 6/7 years old at that price). Bought from a reputable seller with 11 already installed and some sort of warranty will likely be £200+.
Often overlooked, Linux support & update cycles are a minefield and you can end up being prompted to apply dozens of software updates every day (rolling update model) or major OS updates every 6 months. Mint and Zorin are good in this regard as they only do major OS updates every 2 years and minor ones every 6 months.