You might be amazed at the result. Feel free to email me if you like and i will send them to you - free. By the way, I forgot to add, you only have to buy seeds once. Convenctional potting mix is useless in my opinion, as it is too course. I just use normal garden soil, or sow them straight into the garden beds when the cold weather has past.
Seed saving is easy.
I save a new lot every couple of years to keep them viable. 100 kl north of Sydney for years. It is not illegal, providing it is for your own use. There are plenty of sources. Just put stuff lke 'seeds' or 'herb seeds' in your search engine and you will eventually find the ones who have tobacco seeds.