I have received the seeds that I ordered from catalogs. Every year at about the turn of the year the seed catalogs come in the mail. They are nice to page through during those cold days in January. The catalogs usually list the All American Selection winners for the year. Here is the link to their web page -
These are seeds you won't find at the local hardware store or even Walmart. There are usually one or two "new" varieties that I like to try so I order them on-line and try to get the best deal. If you order just once from one of these catalogs I think they will send them to you each year until long after you're dead. Although I am not anxious to confirm that.