Left Handed Womens Golf Club
I'm not a lefty, but if you are, be sure and use a left handed womens golf club. Sounds obvious, I know, but thought it was worth mentioning.
You may not have the same variety to choose from, but most every golf retailer is going to carry golf club sets and individual clubs, including putters for lefties. If you look online, you'll be able to find plenty to choose from.
I was excited to find a site just for left handed golfers called leftiesonlygolf.com. Every club on their site is for left handed men and women.
And be sure and consider custom fitting for your clubs!