Are you looking for a sleeve hitch or attachments that connect via sleeve hitch? Sleeve hitches are tractor specific. I found mine on ebay for my 316 (JD calls it an integral hitch).
I have been watching Craigslist for sleeve hitch attachments and they are few and far between, but sometimes inexpensive when they do show up. Ebay has them, at a price the market will bear, and shipping will be expensive if it's not local.
Retail, of course, will be way more if it's not on closeout. However, closeout deals can be better that used sometimes.