Handful of things worth grabbing from BAS, but not much IMO due to shipping costs and being overpriced.
Products worth mentioning are as follows: BAS blend, Basalt, AgSil, Liquid Coconut/Aloe
Neem, Kelp, and Crab Meals are essentially mandatory with how much better they are than other organic inputs. Just remember to switch the Neem to Karanja prior to triggering flower, as Karanja has zero NPK and Neem has 6-1-2. For one, their combined NPK ratios are perfect. Just the right amount, but nothing too heavy. For two, none of these ingredients will burn/cause issues. For three, all 3 ingredients do more than simply add NPK.
Neem/Karanja: Mandatory for pest management, worms/microbes also love the stuff. Had a fly get in my room a few weeks back and it didn't even want to land on the plants. Gave some to my wife to use on an Avocado plant littered with ants, they went chaotic.
Remember, Neem is a preventative, not a cure.
Kelp: Loaded with an abundance of trace minerals, provides similar stress mitigating properties as Silica, and makes plants overall more resilient.
Crab: Chitin, for more IPM. For those dealing with heavily calcified water, Insect Frass can be substituted here but you'll need another organic Phosphorus input. I only use G&M organic blend because its $17 for a 12lb bag at my hardware store. Use what's local and available, ensuring its quality of course.
I just can’t get over how much it costs to ship a single bag of compost/EWC. 24$ bag goes to 90$+ after shipping. I wanted to try the Oly mountain compost quite bad. Like I understand, but damn.
Defintiely have to take advantage of the sale though.
Buying compost online sucks. Been there, even on Amazon you'll spend $30-$40/bag. Check your hardware, gardening, and feed stores. You may be able to come across something.
Check Craigslist, you'll be surprised. Plenty of people selling compost and EWC if you're in a populated enough area. Used to have a worm farm literally down the street in California, found them on Craigslist. 5g bucket of fresh EWC for $20. May be able to find something.
Worst case scenario, you'll have to make your own. Beats paying $40+/bag though. If you're in a small 4x4 tent and only using 20-30g of soil total, not the biggest deal to pay that much for a bag of compost. If you're outdoors, or using 100s of gallons of soil indoors, that is when costs start to add up on you.