Tom Brady was drafted in 2000 (199th pick) and signed a 3 year contract for $864,000. But his contract was redone in 2002 (5 years, $30.5 million with $10 million signing bonus) after he guided the Patriots to their first Super Bowl win at the end of the 2001. So Brady was a bargain for 2 years.
Russell Wilson was drafted in 2012 (75th pick) snd signed a 4 year contract for $2.99. But his contract contract was redone in 2015 (4 years, $87.6 million making him, at the time, the second highest paid player in the NFL). So Wilson was a bargain for 3 years.
My question remains, has there ever been been a bigger QB bargain over a 4-year period than Dak?