Suffolk rodent rescue. No details of individual rodents online but you can contact them for details.
Suffolk Rodent Rescue – rescue means promise
We've always had boys
On the plus side, they can be less maverick than females and aren't going to get pyometra (womb infection). Their testicles don't really show - except certain times when they are particularly warm, then they descend and protrude a bit. But not noticeable most of the time.