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Warhammer 40,000: Space Marine is on sale for £4.99 at PC World. This is a UK ONLY site. You could use a proxy to purchase from outside of the UK but you might get hit with a foreign transaction fee by your credit card company. I think it’s like 8% or something crazy.
Use the coupon code pcgamer20 to save an additional 20% off.
Space Marine uses Steamworks, so Steam activation is required.