After 10 years my grates are showing wear and I will order a replacement set. The last set I ordered for a mag stoker I was refurbing took about 3 weeks to make it all the way from PA.
So don't wait till you need them. I would think they will have to make parts available for the forseeable future but you never know.
When Hearth and Home Technologies took over they jacked up all the prices. They are just part of a big conglomerate that also owns Heatilator, Heat N glo, Quadrafire to name a few. So some bean counter looks at a spread sheet and sees those products out performing coal products and makes the cut. No consideration as to the niche' market that is coal. As Whistlenut said the price of the VF3000 was jacked to $6,800. and then they wonder why they weren't selling. If they were really savvy to the coal market, they would have increased the price moderately and introduced a new stoker with about 130-140 btu's and I think they could have captured a big segment of demand that the VF3000 was not meeting. As someone on the forum once said, the VF3000 was desgined for the sub-tropical climate of south PA and Maryland.
I'm heating at the top end of it's design range. But my house is well insulated and sealed and I have almost all new windows. It won't overcome leaky old homes in the northern areas.