Out of the three, the second one you mentioned was the healthiest. All puffers are naturally plump, so if he's active with a normal sized and coloured belly, I say get him. He'll only be able to thrive if his tank is fully established anyways. Puffer fish are generally aggressive to those of their own kind, I only recommend getting one and keeping it in at least a 15-20g tank.
If they're not too far away, call them and ask if they do have puffer fish. I think it would be worth it to try and see if you can save one of them, but also worth it if you travel the distance and get a healthy one.
If they're not too far away, call them and ask if they do have puffer fish. I think it would be worth it to try and see if you can save one of them, but also worth it if you travel the distance and get a healthy one.