There are DLC bundles available for free for Mass Effect 2 and Mass Effect 3 on the Origin (EA) store.
The expiry date is unclear, but claiming the DLCs free will let you keep them forever.
- You do not need to own the base game on Origin to add the DLCs to your library, but will obviously need to own the game to use them.
- The DLC bundles include single player campaign expansions, multiplayer map expansions, weapons/armour, and cosmetics.
- Depending on what edition of the base game you own, some content in the bundle may already be accessible in your copy of the game.
Get the DLCs: