わかりやすいのは、Cot's Baseball Contracts ですね。
URLは以下です。
http://www.baseballprospectus.com/compensation/cots/ 例えば質問にもあった田中投手の場合、以下のように記載されています。
=== Masahiro Tanaka rhp •7 years/$155M (2014-20) signed by NY Yankees 1/22/14 •2014-19: $22M annually. 2020:$23M •Tanaka may opt out of contract after 2017 season •full no-trade protection •perks: ・$35,000 moving allowance, ・$0.1M housing allowance, ・Interpreter at salary of $85,000, ・4 first-class round trip airline tickets between Japan & NY •NY Yankees also paid $20M posting fee to Rakuten, Tanaka’s former club in Japan •Agent: Casey Close, Excel Sports ===