I bought a bunch of stuff the other day and one bit is the Bally Computer System, something I've wanted for some time.

System:
Untested, I need to replace the RF connector at the end as it is currently stripped off to the bare wire but still a good 4' or so long. Power plug is still attached and cabling looks fine. Overall appearance is fair, all wood paneling is nice, the plastic cover has some abrasive marks but only visible in reflection with no cracks, gold trim has a few scuffed spots turned black, contacts on the number pad could use cleaning as some sound sticky or hard to press. Currently have found no controllers.

Games:
Just the cartridges - Dog Patch, Grand Prix, and Astro Battle

I plan to replace the RF connector end and hunt down a controller. What is a rough estimate these are going for and what can I expect to pay for a working controller? Are there alternative controllers other than the Bally ones I see?