It's generally not recommended to buy an unweaned baby parrot, the process of raising a baby parrot is very delicate and if messed up, could result in sickness with the baby or sometimes even death. Like others said, you'd also have to take 5 months or so of feeding and close care in order to raise one. Almost all places that sell fertile parrot eggs are scams, anyways.
There are many wonderful breeders who produce healthy babies and even better, lots of big birds that need a home! That would be a much more rewarding route. Even though raising your own baby seems sweet at a first thought, the problems are a bit too high.