Well if you were into sand casting and foundry work you could always use them for ploughs in a sand muller. I know of a few folks that have made mullers and utilized old tiller tines for the plows.
Matters not if pro series of tines are available or not. When I had my TB Horse, I had contemplated on buying a set of them as well, until I seen the price.....so about an hour later out of the shop emerged a set of hardfaced and ground tiller tines that lastd and lasted and lasted, and were till on the machine when I sold it years later. All it takes is a half decent stick welder and some hardface rods......they are easy to hardface and not hard to grind afterwards, and certainly a ton of money less than what they charge for them already done..........
I hardface the cutting edges of my bush hog, and also my push mower and JD GX335 blades. One of these days I am going to mill out a section on the JD's blades and braze in a solid piece of carbide insert. Sandy soil is terrible on tines, plows and blades.........but hardface or carbide is the solution.......
Even better solution is 2 passes with a stellite rod..........and never worry about them again............but stellite rods are pretty pricey but I have seen em go pretty cehap on ebay already......