Well, Jason, Robert and Steve - last I knew Steve has a Model 1450 IH Cub Cadet Garden Tractor that he is working over and I "assumed" this was the tractor he would use the power angle blade on. I'm pretty certain he doesn't have the dual hydraulics set up (but you know what assuming does) which is why I believe it will be expensive to add. Assuming (here I go again) he doesn't have the dual set up then he needs the dual spooler valve, dual handle assembly, hard and soft lines and front ports on the frame. Once he has this then he needs all the hydraulic angle stuff for the blade.
Jason and Robert - you guys have CCC units (1641 Garden Tractor, and 1882 and 2182 Super Garden Tractors). I believe those units all came with the front ports. I don't know if the 1641 came with the dual spooler valve but pretty certain it was standard on the 1882 and 2182 Super Garden Tractors - so you guys are likely way ahead of Steve.
So, how much would Steve need to spend for everything - well my WAG would be close to $1000, if he can find someone willing to sell all the stuff.