millimat if you can wait and your main reason for getting one now is the fact that you'll all be round the house, then wait till you get the pig you want.
Mine were bonded when my DC were in school time, (my boars) so they were left to their own devices during the day.
Is your piggie indoors? He'll get all the noise and chat for now, which although it's not the same as a piggie, it's better than nothing. You can leave a radio on for him when he's alone.
If I was getting more pigs (Don't worry DH , it's an IF ) I'd go down the Rescue route first.
Then if they didn't have what I wanted, a Good Breeder. One who breeds selectively and only lets their sows breed for a couple of years.
Then I'd look at Private Adverts, the non-grabby Gumtree or Pre-loved but I'd give them nothing (or a nomimal fee to cover expenses. They could accept their pig gets a good home, or they could lump it)
Though, I sometimes wonder if my girls had been re-homed as piglets before they got into the breeding cycle, their lives would have been different.
We got GP3 as a Rescue (he was from a Breeder, no idea if he'd been surrendered or was surplus and a by-product of breeding)
But, I reckon it's not where they start off, it's where they end up that's important. Whatever you choose, you'll make a difference to the guinea-pig you take on.