If it seems sick it likely is sick. If you were to get this hedgehog the first thing you would need to do is take it to the vet and potentially get treatment, which could cost more than the entire hedgehog and set up. And then you'd be opening a spot for another hedgehog to come in and possibly get just as sick as this hedgehog. And who knows who will buy this hedgehog, or if they will even know it is sick in time to get it to the vet! You're better off waiting and getting a hedgehog from a breeder with a guarantee on it's health as well as one with good lineage.