For those with more time than money, you can build an open-source Advantage 360 clone for around $100 USD:

- https://github.com/wizarddata/Ergo-S-1

I'm not the creator, but I do have a repo with a purchase list that shows what stuff to buy from AliExpress:

- https://github.com/arcanemachine/Ergo-S-1-Extras

It takes about 10 hours to put together. You'll also need some nerd tools: access to a 3D printer, soldering iron, etc.