As a fellow lefty I know how you feel.
Uncle mikes has a good cheap reversible holster that fits.
For iwb. Crossbreed supertuck. Bar none. Love it.
I agree with ibreevesii, the Crossbreed Supertuck is the most comfotable holster I know of. Others recommend a Kholster because it is cheaper, $40 (Kholster) vs $70 (Crossbreed Supertuck). At Crossbredd use the discount code "NRA" and get a 10% discount. I wear a Supertuck 10 to 12 hrs a day, carry a S&W .40 M&P and forget that it is on. Heard the same about the Kholster.