Hi there.
I’ve a problem, serious problem. My Halo 3 Mythic DVD is broken, and I would know if I can download Mythic DLC for free.
Thanks for your answers.
Hi there.
I’ve a problem, serious problem. My Halo 3 Mythic DVD is broken, and I would know if I can download Mythic DLC for free.
Thanks for your answers.
It’s basically free. Its only a few hundred points on the Marketplace. Not very expensive at all.
Mythic 1 is 400 points
Mythic 2 is 800 points
There isn’t a free version unless you want to buy another Halo 3: ODST just for the Halo 3: Mythic disc; sorry. 
If you use Bing Rewards, you can easily work up 1200 Microsoft Points in a matter of months. That’s the best “free” way I can give you. PM me if you want more information on that. Otherwise, good luck.