GOG has a sale promotion going on that includes some classic Atari titles ripe for the purchase.
Each title listed below, except for one, will run you $4.19 each or you can get all of them for $31.90 until October 11:
- Alone in the Dark: The New Nightmare
- Blood 2: The Chosen + Expansion
- Independence War Deluxe
- Independence War 2: Edge of Chaos
- Master of Magic
- Master of Orion 1+2
- Master of Orion 3 ($6.99)
- One Unit Whole Blood
- Total Annihilation: Commander Pack
Get more details here.