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For the Europeans its -75%, so EPs will be €9,99 each. Keep in mind that you need to own the base game on Steam to be able to purchase EPs. But you can then add the s/n's to Origin.
This is how I cheaply replaced discs and added packs I don't have at the moment. I find having Steam as my go to source better than Origin at the moment. I just picked up Night Life for $4.99 US (cost me originally $20.00 by disc). Definitely a good deal.