Maybe 40 max. I'd offer 20. If you really want it, I'd tell them something is better than nothing. Putting the emotional issues aside a pinstripe is not worth the risk financially. If you do not have a lot of experience with constrictors you may end up with an animal that ends up costing you more than the original asked price in vet bills. It also could be a danger to any other reptiles you may have. If you have the resources to spend on a charity case and that is your thing, go for it. Otherwise step away. Too much risk.