Winchester Model 70 current production includes several left-handed models, including the Featherweight, my personal wish-list gun from them.
Charles Daly (Zastava) sells a .223 Mini Mauser and a .30-06 Mauser in left handed versions. Zastava made the Yugo SKS and Mauser rifles; it's a quality manufacturer. They also sell actions and barrelled actions unfinished, blue and stainless, in left handed versions, for custom Mauser buildups.
Remington 700 and 40XB rifles come in leftie versions. Look on their web site under Firearms -> Left Handed
Weatherby now offers its Mark V in many left-handed versions.
Savage has a full line of leftie centerfire rifles.
Chances are, they won't be on the rack. But they can all be ordered.