If you take your time and shop right, a person could buy a complete set of older used equipment including a tractor large enough to handle it for 15k.
I was at an auction last summer that a guy could have done it all in one shot. Watched a 65 horse massy loader tractor go for 5500 bucks, the haybine went for about two grand, rake went for a hundred bucks, and the round and square balers each went for a touch over 2000 bucks. All older, but working equipment.
In addition you would get your hay done in probably a fifth of the time that it would take with that little tractor and baler. Food for thought.