I do not think DeJong would beat 2/$17M as a free agent, but that is what he is owed. so the player cost would be nominal (maybe more than Bryan Garcia but much more than Drew Carlton)
Paul DeJong ss
6 years/$26M (2018-23), plus 2024-25 options
6 years/$26M (2018-23), plus 2024-25 club options
signed extension with St. Louis 3/5/18
$1M signing bonus
18:$1M, 19:$1.5M, 20:$1.5M, 21:$4M, 22:$6M, 23:$9M, 24:$12.5M club option ($2M buyout), 25:$15M club option ($1M buyout)
at signing, largest-ever contract for a player with less than one year of Major League service time