Oh.......I wish I could help.
I don't know anyone with a puppy to give away or sale for $300. If I did I would sure tell them about your friend and their little girl, but I'm in Texas, so it probably wouldn't help.
However, I am willing to donate some money towards helping to buy one at a higher price if you can find one in your area. Maybe there are some others on here that are willing to do the same. If only 10 people donated $20, you would have another $200. What do they go for in Indiana? Could you tell us a little more about the family? I'd love to help anyway I can.
It is so nice of you to do this for them. God has a special place in heaven for people like you.
I wish you the best of luck and let me know what you think about my idea.