Is this going to be before or after you fix the starter motorbike battery in the splashwell, the boat wiring, the bilge pump, the Epirb, VHF and safety gear etc....?
The anchor ball retreiver is under $100...
With a winch you will also need decent rope(probably expensive dyneema) a good fuse and switch and heavy cable from the bow to the console plus the knowhow to choose those components and put it together ..and do you intend running the winch of the $30 ebay battery..?