I have been watching E-bay for the past few years, waiting to replace (or pick up spare parts for) my sherpas, but the sightings are few and far between.
Sherpa was bought out a few years back ~ Maybe 6-7 years back. They had actually ceased production, and then there was something like a family or father/daughter team that bought the remaining Sherpa product line and started to do repairs and such, but that quickly died out and they were very difficult to work with. I don't know what happened to them. I have their phone number and address somewhere, if I find it, I will post it here.
This was their old website
Sherpa but it is since been inactive.
I agree with Kevin, hang on to those Sherpas, They are made with quality. Mine are pretty beat up but I love them. I have the 1.5" alpine claw - I wanted Sherpa update mine and put a heel Crampon on them as they had with their newer models, about 8 years ago, but they had nothing available at the time.
For the Gold Snowclaws, Sherpa used the white laces up until the early 90's and then switched to black laces and added a heel crampon option about the same time. My biggest problem was wearing my sherpas with my plastic boots. I ended up buying a solution from them for $20 in '97 - It was a nylon strap that attaches to each side of your heel strap and clips together over your ankle - Keeps the snowshoe from sliding off the rigid boot over time.
I did have several chances to buy the Bill Pratter step-in bindings, but both times thought the price tag was outrageous. Now I wish I had spent the money.
Good Luck