Was wondering if Cornucopia seeds are well worth the time

I bought a Super Sweet 100 Hybrid and a Beefsteak...It doesn't say organic or not but on the back it says " Not treated or genetically modified" Is that organic?

Also I was wondering what starter soil I should get

Heard good from these: Jiffy Mix, Pro-Mix, and Peter's Potting Soil. All soilless. Interested in Pro-Mix...Can't find any nurseries selling that though (San Jose, California 95148)

If I order online 16quarts- 3cu ....how much would shipping be? Alot?