I've never had more than one male at a time, but I understand they can have issues getting along if they go through adolescence at the same time. Around 6 to a year months, I believe. You might be better off looking for an older boy or a spayed female.
Have you tried Petfinder, Craigslist and Petharbor? CL is a bit of a gamble but Petfinder will show your local
GP rescues, who will help you find the best match. Petharbor gives you all the pigs in shelters and it's updated frequently.
Good luck finding him a new friend.