Skinny pigs do need buddies just like regular pigs. They are prone to a host of health issues, the most common of which are abscesses from hay pokes and recurring bouts of skin cancer.
They're not hugely common in rescue right now, but I also wouldn't suggest going to a breeder. Breeding standards for guinea pigs are hugely 'livestock' influenced -- most of the breeders keep their pigs outside in small barns or sheds, keep them in very small cages, do very little breeding for health (in fact, there are many highly specific health problems which are primarily seen only in show pigs), and don't enforce no breeding contracts like rat breeders do.
We are as gods to the beasts of the fields. We order the time o' their birth and the time o' their death. Between times, we ha' a duty. - Terry Pratchett.
"Men have forgotten this truth", said the fox, "But you must not forget it. You become responsible, forever, for what you have tamed. - Antoine de Saint-Exupéry