Cabot markets a full left hand 1911a1 series .45acp pistol. They are not cheap!
Other left hand/ambi style pistols include: Walther PPX, P-88 9x19mm, EZ9, P2000 & P2000sk, CZ85 Combat, Beretta PX4 Compact, FNH's FNS pistols, the P30, the HK P7m8/P7m13.
The rare Walther P5 9mm(9x19mm) ejected to the left but it's out of production.
Walthers new duty size pistols like the PPX & PPQ are ambi type. The Ruger SR line has many ambi controls too.