What kind of domestic bird was this?

My husband and I saw a bird in a pet store years ago and are trying to remember what breed it may have been. The bird was about the size of a parakeet, a bit larger than a lovebird. It was almost all bright yellow and I'm pretty sure it had a bright red beak but I don't think it was a hooked beak like a parrot has, it was a small, straight, short beak. I don't' think there were feathers standing on end on it's head like a cockateel....it did amazing tricks in the cage so it must have been quite intelligent. It made a nice sound, not an ear blasting squak like my mothers parrot makes.