Greys are the best! Do you know there are two types? Congo and Timneh? The Congos are a little bigger.
I had a Congo that died from egg-binding, and it’s all my wife’s fault. One day, I will tell the story here.
Look for a YOUNG bird, or one that readily steps onto your hand. DON’T buy a bird that seems very scared of you. It is not your responsibility to “save” a problem bird, and don’t be tempted by a low cost. You don’t need or want the aggravation! Look for a friendly bird who LIKES you, even if it ISN’T a Gray!
Parrots aren’t like cats and dogs. They’re not going to suddenly change their opinion of you after a day.
Below is a photo of my Yellow Nape Amazon, 15 months, after eating sweet potato.