I think you probably need some sort of license or certification first of all to harvest and sell it and I imagine you would need to sell it to pharmaceutical companies who manufacture anti-venom. It might be a good idea to phone around local wildlife centers, reptile houses or zoos and that sort of thing to see if they have any info.

Fuhgeddaboudit! No reputable pharmaceutical firm would buy from you. And the market is VERY limited.

Quite a statement considering that you don't know me.