I don't do much reposting but I think cannoical links prevent duplicate content. But I may be wrong about that. I'm not sure any affiliate network would be keen on duplicate content but repurposing content, I think, would be different. For affiliate programs, I like Impact, share a sale,, appsumo, and there's a ton others. I think what makes the most sense is to find some good affiliate programs in your major niche or niches. That seems to work well for me. I hope that helps!