Looking for great varieties of heirloom seeds...guess what? you probably won't find them in the stores....go to the source, the farmers! Just in case you don't know any farmers you can get started on Etsy.com
Check out this treasury page for a hand full of shops who sell seeds to get started:
This page expires tonight at about 11:30 eastern time so if you're reading this after Thursday June 18th, try going to Etsy.com and searching for "heirloom seeds". You'll be buying a product that tastes better, is better for the diversity of our farms, and supports small scale farming operations and small business owners...go on now, get to it!