Please Help Save Obi-Wan From Parvo

Hello my name is Dana and this is my puppy Obi. He is a german shepherd and is only 8 weeks old. I found him for sell on Craigslist and immediately drove down to Conroe that Thursday night on July 6th to pick him up. It was love at first sight. I took him to my parents and introduced him to my family like he was my new born baby. We were all delighted to have him. Unfortunately my husband and I noticed a strange behavior from him. He wasn't a normal hyper playful puppy. He is very lethargic even though he tries to play, and barley eats anything. Luckily I can get him to drink with no problem. His stool is runny like pudding and he threw up for the first time today. I knew it was time to rush him to the hospital after noticing his heavy breathing in his sleep. The doctors tested for Parvovirus and our worst fears came true, the results came back positive. This virus is fatal if not treated soon. The doctors said we caught it early though and have a high chance of saving him. They explained that this virus attacks the puppies immune system and digestive system causing him to starve to death, vomit blood and have bloody stool. My husband and I can't afford to pay this all at once and desperately need help saving this innocent puppy. Please help us give the treatment he deserves, he's too young to die so soon.