Koyker has been mentioned. They seem to specilize in mounts for Gray imports. I'd check them out. I paid something like $2400 for the loader on my machine, mounted.
I'd say your dealer tossed the loader in at cost when you bought the tractor then. If we sold 155 loaders for $2400 we'd soon go out of business.
We also sell loaders at close to our cost (inlcuding freight and installation) when we install it on a tractor on the lot. Aftermarket sales pay a mark up.