Gnar the dumpster kitten

My co-worker and friend found this small fry while taking out the trash at work. This three to four week old kitten was dumped there with no friend in sight and boy did she cry. Thankfully all that noise lead to her discovery. I began to take care of her, she used the litter box for the first time today :3, and though initially fearful Gnar seems to be turning things around. Unfortunately I don't have the best job ever and I attend school; book prices are crazy. Little Gnar needs to see a veterinarian as soon as possible; I can count her ribs, vertebra and every other bone in her tiny body. I need help to afford to get this kitten help.