You should be able to find parts balers cheap enought. The M&W balers around here are bringing scrap price. There is almost no one using them around here. They did not work very well. I am surprised that you get along with the darn thing. The hay had to be just the correct moisture or the chains would get plugged up.
Call Schmitt Implement At Holy Cross Iowa. They had one that they never sold from new. They rented it out a few times but that was all the use it had.