M.M.
Try Mercola.com -
If you don't want to do mail order, then there are the usual suspects; Market Street, Sprouts, Whole Foods. There is also a little, but well stocked health food store north on the 75 a few exits. It is in the NE corner of the older shopping mall on the east side of the expressway. The mall also has the North Texas Driving School in it....I think it's technically, McKinney. Sorry I can't remember the name of the store - I think it's Bob something...but you can't miss it. If you go to 380, you definitely are too far.....I'm thinking it might be at either Eldorado or White.
Let me know if you find it and how your "cooking" goes. I am interested in getting mor probiotics in my diet as well.
Good luck.