A retail pack with hobby-level inserts.
I purchased this 6-card retail pack of 2016 Donruss Baseball for $2.90.

David Ortiz is the featured player in this years set. He earned three World Series championships (2004, 2007, 2013) in his first 19 years with the league. Can he make that four in his 20th season?
Base Cards
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46 - Edwin Encarnacion

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143 - Troy Tulowitzki

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188 - Pedro Martinez

Insert Cards
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D82-19 - Buster Posey (odds 1:1*)

Posey recorded his 100th career home run on September 6, 2015 at Colorado.
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TP8 - Rafael Devers (odds 1:12*)

Devers participated in the Boston Red Sox's 2016 spring training. He's currently rated as the teams number 2 prospect and number 14 overall.
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PA9 - Eric Hosmer (odds 1:12*)

Hosmer won his third consecutive Gold Glove Award in 2015.
Retail packs are a rip off considering this series isn't licensed by the MLB, and you can find hobby packs for the same price; with that said, I managed to acquire a retail pack with three inserts, so I can't complain about this pack.
*Please be advised these are the hobby odds. Panini didn't reveal the retail odds, so I listed the hobby odds to give you a perspective on the rarity of the subset.