I picked up a JD PowerFlow for my 62C deck along with a MC519 material collection cart. These are used on the X series and the 4xx series JD's. I had a "hitch" frame welded up that attaches to my 3-point - this raises and lowers the MC519 and secures it so it trails my JD 2305.
I bought the powerflow and the MC519 used - works great. Paid ~$200 to have the hitch made including a set of 3-point pins.
Picks up leaves very well, raises the MC519 for dumping, no extra motor to make noise or maintain. And, it's JD green.
Good luck - there are options! I think ProTero makes a unit too. TracVac PTO is nice, but $2500 is a chunk of change.
Scott