Please post in the UK and European Marketplace found here:
www.monsterfishkeepers.com
As to the cost of your IDS, you'll probably find it difficult to even give them away for free.
If you can find someone who will actually attempt to keep them alive, count yourself fortunate and take the offer. Unfortunately, when dealing with fish species that are fast growing and cheap to acquire, the fact that you've got larger specimens can make them lose so much value that people in your situation often have to essentially bribe people to take your fish instead of being able to sell them.
Regardless, you're doing the right thing and I commend you. I'd normally delete threads like this due to specific rules of the US marketplace, but for the UK I'll move this thread to the correct area.
fishhead0103666
well done, thank you