Guinea pigs cost approximately £20 each, and can live for up to 8 or 9 years if they are well cared for.
They live in a hutch, and are usually alright to have a rabbit as a companion, provided it is not one of the larger breeds.
Alternatively they can live with another guinea pig. Two males will fight unless they're brothers and a male and a female will breed, so it is best to get two females, who will live agreeably together.
It's best to get professional advice on this when buying your pig.
Pigs love fresh veg
To feed guinea pigs, just give them a bowl of dry food, some water, and a few vegetables to eat each day.