Innings-limited David Price has pitched only 105.1 innings this year, not enough qualify for the FanGraphs fWAR rankings:
https://www.fangraphs.com/leaders.aspx?pos=all&stats=pit&lg=all&qual=y&type=8&season=2019&month=0&season1=2019&ind=0&team=0&rost=&age=&filter=&players=&startdate=&enddate=
Among all pitchers this year Price ranks 49th with 2.3 fWAR, valued at $18.2 million:
https://www.fangraphs.com/leaders.aspx?pos=all&stats=pit&lg=all&qual=0&type=8&season=2019&month=0&season1=2019&ind=0&team=0&rost=&age=&filter=&players=&startdate=&enddate=&page=2_30
One website lists Price with a negative value of $44.8 million, which subtracted from the $96 million he's owed, leaves about $51 million over three years, or $17 million a season.
https://www.baseballtradevalues.com/trade-simulator/
With a 4.25 ERA over an abbreviated 105.1 innings and an IL-stint, a 34-year-old Price might be hard-pressed to land a three-year contract at $18 million per.
A decent comp might be Cubs lefthander Cole Hamels, a pending free agent who is 20 months older than Price. Hamels, with his own IL stint this year, has posted 2.4 fWAR, valued at $19.1 million, in 109.2 innings.