What is the cost of a D&RGW K-27 2-8-2 slide valve MUDHEN train?

Question

bought at a auction, and i cant seem to find the exact one.

Answer 1

Wow, looks like a nice model you have there!  According to the list below they run at least over $300 each.  They sure are nice looking steamers, best of luck with it on your layout.

Answer 2

$328 for the Blackstone at caboosehobbies.com.

If the exact one isn't a Blackstone, Mountain Model Imports are in the same price range but they have dozens of different K-27's, with and without dog house, for example, differing paint schemes and logos for different periods, etc.  They may have the exact model, but you didn't include the manufacturer in your question.