Please go to a rescue instead of Pets at home or other pet shops. I've just been helping out at a rescue today. The lady there has taken on about 100 unwanted guinea pigs and about 20 unwanted rabbits from breeders who got out of hand. Some of the animals have come to her pregnant, so there are many more on the way. There are all ages, breeds and colours to choose from, and they are all cute and friendly.
If you are in the Kent area, here is a link to the rescue I was at today.
Rescue
There is bound to be one near you so please have a look if you are thinking about getting a new pet. Thanks! :)