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Awesomenauts is on sale for $6.99 (30% off) direct from Romino Games. The game uses Steamworks, so Steam activation is required.
Alternatively, if you want to pick up a three pack, it’s on sale for $15.98 / £11.18 (20% off) at GamersGate / GamersGate UK. That’s about $5.33 per copy / £3.73 per copy.