The semi-automatic FN SCAR 17S, which chambers 7.62x51mm NATO, was supposed to be on sale this year, but FN-USA have announced that it won't go on sale until 2010 ...
Released for 2010 is the highly anticipated SCAR 17S now available for civilian purchase. Chambered in 7.62x51mm NATO (308 Win.) and slightly heavier than the SCAR 16S, this unique carbine offers long-range accuracy, exceptional reliability and match winning versatility.
Both SCARs have fully ambidextrous operating controls, a free floating, cold hammer-forged Mil-SPEC barrel with hard-chromed bore; a receiver-integrated MIL-STD 1913 optical rail plus three accessory rails for mounting scopes, electronic sights, lights, or lasers. The side-folding polymer stock is fully adjustable for comb height and has six settings for length of pull. The SCAR also features a tactically advantageous reciprocating charging handle for quick ammo and magazine failure response.
SCAR 17S (top) and its smaller brother the 16S.
Good news, the civilian semi-automatic SCAR will be launched next year (2009).
Both versions will be available: the .223/5.56mm SCAR 16S (civilian equivalent of the SCAR-Light) and the .308/7.62×51mm (civilian equivalent of the SCAR-Heavy).

SCAR-Light carbine (14″ barrel). The civilian model will have a longer barrel.
I have emailed FNH USA for pricing details but they have not yet got back to me.
From the press release:
Experience the civilian-legal semi-auto only version of the rifle chosen by U.S. Special Operations Command as its first new rifle since the early 1960’s. The SCAR 16S is chambered in 5.56X45mm NATO (223 Rem.) while the SCAR 17S fires the 7.62X51mm NATO (308 Win.) cartridge. The innovative gas-operated, short stroke piston system reduces fouling for greater reliability. The side folding polymer stock is fully adjustable for comb height and length of pull and is colored authentic USSOCOM Flat Dark Earth. Both 10 and 30-round detachable box magazines(DBM) are available, and the ambidextrous operating controls instantly adapt the SCAR S-Series to any user.
Unfortunately they will not come with this …

UPDATE:
Photo of SCAR 16S:
