You have read right, two are much happier (most of the time) then one. This site does not support the breeding or selling of pigs due to the overpopultion crisis, lack of care many breeders offer their pigs, and the fact that sows have a 1 in 5 chance of dying of pregnancy related complications everytime they have a litter.
Petfinder is listing several pigs in Oklahoma, I am not so sure how near they are to you. Keep in mind that a lot of shelters do not list their pigs on their weblistings, it is best to call. Also vet offices can be a source of finding pigs, so can classified ads in your area. Just watch out for the back yard breeders trying to dump their stock!
Typically if you get a pig from a shelter, it is much healthier then petstores or even a lot of breeders.