Shortly after getting Jeff, my younger brother wanted to get a bird, too. At the time I didn't want it to happen, but I'm glad it did. Jeff and John bonded very quickly.
John came from a slightly better store than Jeff. Although the cages were small, they still had some toys and cleaner conditions. Recently, I saw the petstores use natural sekelbos wood! So they take decent care of the birds.
In the cage, there were two females that looked almost like this(the blue and yellow was more scattered and the budgies were whiter)
And then there were another two(three?)green guys. My brother wanted a very specific green budgie, so we had to wait 10min for the lady to catch the right budgie : /
So then he was put in a box, and we brought him home.
When he met his friend(yes, no isolation because I had no idea it was important... none of my birds were isolated, except Griffen who didn't interact with the flock for a few weeks), it was love at first sight. They became best friends at that moment.
John even had mites at one point. I just bought pet store stuff and applied it to his nose. It worked, but a vet probably would've been better help.