To my knowledge, the 3-point hitch was never offered as an option on a Cub. I think that I paid $400 - $450 for my Worksaver 3-point hitch. It works great with the small 3-point implements that I had for my little Kubota, just as long as it is not a PTO powered implement.
I use mine a lot and is a fun way to get use from my Cub. I just took the C-2 mower off of it because I found that I didn't use the mower as much as I thought since I have other mowers that I use on my Kubota and my AC Model B.