My green cheek conure came from Petsmart (I know, I know, but I fell in love sorry). I have had him 4 weeks and he seems happy and healthy. He is also a sweet, sweet bird - very friendly and tame. The conures though get vaccinated for polyomavirus and are tested for chlamydia psittaci and psittacine beak and feather disease. Don't believe they do any of this with parakeets.
I also tried to google Barney's and couldn't find much info. I will say I am extremely happy with my conure. Just quarantine your new baby as mentioned above.