I'm not sure as I've just started exploring the gardening skill myself, but the packets at the beginning are "Starter Packets" meaning they are available to start with, but they don't contain all available seeds. In my limited experience there appears to be four seeds to every packet though they won't always be different. Perhaps tomatoes require a higher level gardening skill to get? My garden is only level 3 so I don't know what level you start getting new seed available from the store, if at all.