2009, $500k+:

Miguel Sano, SS MIN — 3.15m
Gary Sanchez, C NYY — 3.0m
Guillermo Pimentel, OF SEA — 2.0m
Jose Vinicio, SS BOS — 1.95m
Eduardo Salcedo, SS ATL — 1.6m (2010, actually)
Jurickson Profar, SS TEX — 1.55m
Cheslor Cuthbert, 3B KC — 1.35m
Jorge Alfaro, C TEX — 1.3m
Luis Sardinas, SS TEX — 1.2m (also seen 1.6m)
Juan Urbina, P NYM — 1.2m
Paul Carlixte, SS KC — 1.0m+? (never heard whether his signing was actually official)
Cesar Perez, SS TB — 1.0m+?
Wilfredo Solano, SS OAK — 1.0m
Wilson Contreras, C CHC — 850k (Suspended - roids)
Michael Feliz, P OAK — 800k (Suspended - roids)
Santiago Nessy, C TOR — 750k
Humberto Valor, SS CIN — 690k
Eladio Moronta, OF NYY — 570k (20 years old; previously suspended)
Rosell Herrera, SS COL — 550k

2008, 500k+:

Michael Ynoa, P OAK — 4.25m
Yorman Rodriguez, OF CIN — 2.7m
Rafael Rodriguez, OF SF — 2.55m
Adys Portillo, P SD — 2.0m
Juan Duran, OF CIN — 2.0m
Luis Domoromo, OF SD — 1.25m
Roberto de la Cruz, 3B STL — 1.1m
Julio Morban, OF SEA — 1.1m
Giancarlo Arias, IF NYY — 950k
Ramon Flores, IF NYY — 775k
Jose Valdivia, P SEA — 726k
Alex Monsalve, C CLE — 715k
Oscar Perez, C BOS — 713k
Gustavo Pierre, SS TOR — 700k
Jackson Valera, C/3B NYY — 675k
Yeicok Calderon, OF NYY — 650k
Aderlin Rodriguez, 3B NYM — 600k
Carlos Perez, P ATL — 600k
Cesar Valera, SS STL — 500k+

2007, 500k+

Michael Almanzar, 3B BOS — 1.5m
Kevin Deleon, OF NYY — 1.1m
Jharmidy Dejesus, SS SEA — 1.0m
Julio Teheran, P ATL — 850k (not exactly under the radar, nor are many of these guys)
Gabriel Noriega, SS SEA — 800k
Arodys Vizcaino, RHP NYY — 800k
Wilmer Flores, SS NYM — 750k
Johnathan Galvez, SS SD — 750k
Elio de la Rosa, 3B NYY — 700k
Henry Pena, OF NYY — 600k
Juan Silverio, SS CHW — 600k (Age concerns?)
Martin Perez, LHP TEX — 560k (like I said…)
Wilson Suero, SS TEX — 558k
Jeffrey Marte, 3B NYM — 550k
Eduardo Sosa, OF NYY — 525k

He signed at 19 years-old, and received a $6 million bonus.

From all reports out of Ranger camp this spring