They wouldn't happen to have a Nickel Plate RR diesel F or E engine, would they?
The link I gave only sells tools and parts relating to the conversion of NMRA standard HO rolling stock and track to Proto:87 (exact scale-down of prototype) dimensions.
I don't know off the top of my head who sells E or F units with the Nickel Plate roadname; there are many manufacturers to choose from. If nobody's producing on in a Nickel Plate paint scheme, you'll just have to buy an "undecorated" unit and do the airbrushing and decaling yourself. Also, many of the better railroad hobby shops offer modeling services and would detail and paint a locomotive to match your preferred prototype.
It really comes down to what you want vs. what you're willing to pay to get it.