The price for the pack has now gone up to $9.99 (it was a Daily Deal), but individually the prices are:
-Dark Forces: $2.49
-Jedi Knight: $2.49
- Mysteries of the Sith: $1.49
- Jedi Outcast: $4.99
- Jedi Academy: $4.99
So depending on which 2 you already have it still might be cheaper to get the pack. o_O