We previously have mentioned some Quad-A type players who would be worth a a gamble at the 3d base position.  Dave Cameron has an article at Fangraphs which picks out a few minor league free agents of interest.  I particularly like Reuben Gotay, who might be a nice gamble for the 3d base position.  Gotay used to be a 2d base prospect, but defensive range issues held him back, but now he is playing 3d base more. Cameron says of Gotay:

While playing for the Diamondbacks affiliate in the PCL, Gotay racked up a .272/.429/.450 line that shows off a strong ability to control the strike zone. He drew 102 walks and struck out just 69 times, and unlike some minor league walk aficionados, he actually flashed some power – 42 of his 101 hits went for extra bases.

As a switch-hitter with plate discipline and power, Gotay has a good enough bat to play in the majors. His defense is the question mark, but teams with an opening at 3B or a willingness to sacrifice some range at 2B should be willing to give him a shot. Heading into his age 27 season, his best days may still be ahead of him.

I particularly like looking at these Quad-A players because the team doesn't take much risk signing them.  Cameron also links the full list of minor league free agents, but I haven't had time to look through it yet.  If you want to take perusal and comment on the list, I can give the direct link.  Most of you know the term, "Quad A" or 4A player, but I'll explain it for those who don't.  Some players are prospects who succeed at AAA, but--for whatever reason---do not succeed at the MLB level, and then leave the prospect stage after they age beyond 25 years old or so.  These players often continue to excel at AAA, thus earning the title "Quad A player" as if they are ready for a new league between the majors and AAA.  Some of these players never made it in in the majors because they weren't given a good chance, had bad luck, or just played behind better players.