Discounted T-shirts in the store

The Norman Conquest gives up...

Player NameSalary
Didi Gregorius PHI SS L 10IL $9
Has $8 free, will have $8 free

Fill in the blanks on either side - SS for a mid-tier pitcher like this?

Smallpox Sox gives up...

Player NameSalary
Frankie Montas OAK SP R  $9
Has $9 free, will have $9 free

Yeah, alrighty

The league has approved this trade

Approved: 3 Vetoed: 0 Abstained: 9