I bought two guinea pigs on 26th aug and found a massive lump on one yesterday. Big abcess which so far has cost me £40 and we've got to be back at the vets next week. I have a receipt which said if pet becomes ill after buying to ring pets at home and I remember the sales assistant said something about them paying for any vet bills if they became sick soon after buying.
If I have to pay it myself then fair enough but if I can get them to pay then its worth a try? I reckon the abcess must have been building up when I got them because it was huge, golf ball size.