OMW almost missed Humble's X3 Weekly: https://www.humblebundle.com/weekly

For $1.00 - $5.99 you get:
X: Beyond the Frontier
X-Tension
X2: The Threat
X3: Reunion + Bonus Package

For $6.00+ you get (above average)
X3: Terran Conflict
X3: Albion Prelude
X-Superbox Bonus Material

Hurry, only 3 days left as from this posting date.