Valve is under the impression that you want to buy multiple copies of one game at a huge discount and then give them as presents.
Perhaps eating turkey at Thanksgiving has odd wallet-loosening side-effects.
Six copies of four-player co-op action RPG game Borderlands costs £40; eight copies of Deus Ex: Game of the Year Edition costs £8; six copies of R.U.S.E costs £90; and 10 copes of Half-Life 2 costs £14.
Those are today's sale items. They're available for seven more hours. When that timer runs down, a new batch of deals will go up.
The sale itself ends on 29th November.