You’re gonna want to get an Austrian scythe. They’re the easiest to use, and are adjustable (important, as to use it effectively it needs to be set up for your height / frame).
Avoid the urge to get an antique one. They look cool, but the odds of it being the right size for you are slim, and they often don’t fit modern blades, meaning you’re stuck with whatever it comes with.

I paid around £150 for a scythe and kit. Make sure you get at minimum a snath (the wooden bit), blade, whetstone, and whetstone holder (you fill this with water and keep your stone in it- your stone needs to be wet to work, and you have to sharpen the blade regularly while using it if you’re doing a reasonably sized garden). You’ll probably also want a peening jig (for reshaping the blade if / when it warps).

It’s decent exercise, and satisfying, but takes a bit of learning.