Coaldale, PA
Quoted from mbaumle:Looks like they're still in stock here:
http://www.starship-fantasy.com/ramps/Whitewater-Boulders
I got my last set from Marco Specialties, which I'm assuming got them from Starship, since they're the same shade of brown. There's a guy in Europe making these, I believe, but they're super dark brown, and not at all the same shade as the originals.
Edit: Sorry, looks like they're out of stock there too. Sorry. Still, Starship Fantasy is who usually makes these for distribution I believe. Perhaps contact them to see if there is a plan to remake them anytime soon.
Anybody have a boulder set for sale?
