My nephew is in his final year of urology residency, finishing next May. He regularly gets offers of signing bonuses of $1 million to join practices all over the country. The supply/demand ratio in his specialty is insane.
Addendum: not just him; all his fellow residents get the same offers. The 5-year-long residency (after 4 years of medical school & 4 years of undergraduate college) produces about 350 urologists/year in the U.S.