Am I to young to get a boob job at 19?

A breast augmentation should be just fine for you, but you can only get saline implants.  You can wait until you're 22 to get silicone or get them switched out at that time if you'd like.

I cannot comment on what  other surgeons charge for breast augmentation. I would definitely make sure that your stable with your hyperthyroidism. You definitely need a personal consultation to determine size, style and placement of your implants.