Vet bills for my sister’s little kitten Harry who may have a broken leg

My sister has been going through a rough period lately. She has split up with her husband and are now living with her two young children. About a month ago she got a little kitten, Harry, who she love to bits. But today he jumped off the sofa, landed badly and might have broken his leg, or dislocated his hip.. The cost of an (much needed) X-ray is 500 pounds, and she really can't afford that, so the kitten might have to be put down if he doesn't improve by Monday.

Losing Harry is something she really doesn't need right now. She's been through enough, and Harry is her sunshine and calming factor at the moment. So if anyone could be so kind to help, that would be very much appreciated.

Please help my sister!!