My printer was about 350 bucks, but a gift (I have a nice grandfather). It's an XYZPrinting Da Vinci Jr 1.0 Pro (boardroom monkeys really had a fricking ball with THAT name). It's actually a fairly decent printer, of which I have 0 reference to, as it's the first and only 3D printer I have ever had any real contact with.
I'd question anything that costs 100 pounds. I'd expect support to be BAD, software to straight up not work, and the thing to have ditch bank build quality. The big price afaik are the stepper motors, as well as all the tracks and mechanical frameage.
There's the old addage you get what you pay for. This, applies to 3D printers as it does everything.