Almost forgot about the cheap side:
keywiz eco or gpwiz eco + classic mouse hack. Less than 25 bucks assuming u can find the mouse.
ms ball mouse with scroll are one of the easiest to hack even for those with very limited soldering skills.

As for the eco, you just need an ide cable for the interface and wiring.
But again, if cost is not an issue or got more to spend, take the other option.