Lowe's has Sunshine #4 mix - if you want that ( $24.00 ) kinda pricey but a great brand.
BUT ...
they also have this mix ....
Trust me on this soil , it grows very well and is relatively cheap.
... Because there will a shitload of haters about this particular brand . I only share what WORKS ... I don't bullshit anyone wanting to know how this does indoors. It is a LIGHTLY PRECHARGED peat based mix. It works fabulously. All my seedlings START in it and or go into a container with it for a full grow.
It will not burn out of the bag ... Soak your seeds for a few hours to hydrate ... Plant seed in and water slightly to moisten and go have a sandwich. It does not compact when wet and is more aerated than other mixes -
so I do not add perlite to it. It dries fairly quickly within a couple days so keep that in mind. I start them in standard solo cups until they are old enough to plant as a plug. You will see the seedlings grow with speed and color.
I add nothing , but water.
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The other mix I use is from Home Depot - Dr. Earth
This is an ORGANIC based mix that has OMRI rating if that is important to you , to me not so much. It is a more compact mix when wet and recommend perlite for this one.
Think of this as a FOX FARMS OCEAN FOREST MIX
LITE ....... It is full of mycos and other goodies right out of the bag and will carry growth easily for 5 weeks before needing nute help.
I also combine the two mixes occasionally- Dr.Earth at BASE 1/3 of container for a CHARGED mix and top off with the peat mix ( which lets roots run wild ).
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There is no need to drop a lot of money on bags of soil ... I stop using FFOF only because I get more from my plants with these . They will begin tap out near the first 2 weeks of flower but I am already getting ready to use bloom nutes by then. Also be aware there are strains that will be heavy feeders so your mileage will vary .
Peace
I gotta go make a sammich