The mass-market seed companies are unlikely to offer any variety of mint beyond the basic peppermint, spearmint, lemon mint, apple mint and chocolate mint that you likely already have. Here are some less-known companies/organizations that I have either bought from or heard about:

• Herbs | Baker Creek Heirloom Seed Co
• Fragrant Fields-Herb Plants & Perennial Plants Shipped to Your Door! *****!!!!!
• Herbs - Johnny's Selected Seeds
• Mint | Park Seed Co.
• Herbs - Rohrer Seeds
• Herbs - Seed Savers Exchange

And there are more in the directory of Best Vegetable Seed Companies - Organic Gardening - MOTHER EARTH NEWS . NOTE: if you get a 404 Error Page, look carefully at the URL in your browser's location window, and trim off the unneeded, extra parts.

Growing mint from seed seems like the hard way to do things, given that mint roots so well from cuttings.