Not sure about Shannon but the 141s are not making more than E110-E120 or its equivalent. Other liveries are going for even less than that. There are some on there for up to STG115 but they are still there. In the last few months I have purchased 187, 184, 171 (twice) all at less than Eur121, but I agree that if you chum the waters enough, someone will eventually bite.
I realized that would likely be the case. It's not my thing but I have seen several rebuilds of the Class 80s on the fora so I thought someone might be interested