I'm not sure what you mean by Cornucopia seeds.* Do you mean the site?* They're in Australia.
You can use this site to check references for mail order nurseries.* You can search by plant material and/or state for what is near you.
If the seeds aren't labeled 'organically grown' then they aren't.* You can do a google search for sites that sell organic veggie seeds with terms like:
organic vegetable seeds
You can search google with terms like:
Jiffy mix + soilless mix
Jiffu mix + soiless mix
Pro mix + soilless mix
Pro mix + soiless mix
and see what others say about each one you want to know about.
Considering where you live, I would think you could easily find some type of seed starting mix.* Have you searched at the big box stores like Home Depot and Lowe's?* Maybe call local garden centers and ask them or see if they have a website in the yellow pages.
Maybe I'm a bit presumptious here, but I get the impression from your questions that growing seeds is new to you.* That's ALOT of soiless mix!* You also mentioned in one post that you didn't have 6 hours of sun for your outdoor garden.* I'm a bit confused why you need so much.* One tomato plant will take up alot of space once it gets mature.* You only need the seed starting soiless mix until the plants sprout.* Once they get large enough to transplant to larger pots, you can use potting soil.* That is also a soiless mix as well.* It would be most helpful for you to post the links to the products you are considering.* An example of what I mean is at the bottom of the page here. One bag of Premier Pro Mix BX (the second one on the page) is 3.8 cu ft. in a compressed bale. Once it expands you have enough mix to pot up "approximately 10 one gallon trade pots or 14 eight inch hanging baskets or 57 four inch square pots or 7 bedding plant trays."* That's alot!* Just how many plants do you intend to grow?
If I order online 16quarts- 3cu ....how much would shipping be? Alot?
I don't know what you're using for pots or if you are using starter trays aka bedding plant trays, but one bag of something like this should work just fine for you. Last year I used less then one bag to do 4 bedding trays!* Look at this Professional Jiffy Mix and to the right for other mixes.* You should be able to easily find these at a good nursery in your area or in Home Depot, Lowe's, K-Mart, Wal-Mart, etc.
If you explore the site you will be able to figure out what it costs to ship.
When weeding, the best way to make sure you are removing a weed and not a valuable plant is to pull on it. If it comes out of the ground easily, it is a valuable plant.