These types of articles always make me spit up whatever it is I'm drinking.
I desperately want to find the league where Matt Garza, Baseball America's 21st best prospect on their Top 100 Prospects List is a "sleeper". Or Jason Bartlett, a guy who earned $12 last year in little over half a season. How is Ryan Shealy a sleeper? He has the job and played half a season in the majors last year.
From this entire list (not including the "deep sleepers" at the bottom), I'd say that Al Reyes is probably the only one I'd call a sleeper. Anyone you're going to spend $4 or more on really isn't much of a sleeper anymore...at that point, at least one other owner thinks enough of the player to be bidding against you.
Even the deep sleeper list is kind of funny. Ryan Garko a deep sleeper? The guy smoked the ball over two months last year in the majors. If anything, I think he'll go for too much.
If I remember, I'm going to re-visit this post after my A.L. auction in April, and see what these "sleepers" went for.
And I'm going to see if I can't get into one of these leagues Aaron Gleeman is talking about where these guys are considered sleepers.