I make my own compost from oak leaves and grass clippings, layered and mixed. I’ll add other stuff sometimes but it makes a rich, worm filled soil for top dressing and amending this red clay soil I have. And triple 8 is my go to garden and all around fertilizer. But the blueberry bushes I go ahead and use a little of the ammonium sulfate it does make a difference in fruit production over just top dressing but the bushes are healthy either way.
I was spoiled with the easy and cheap supply of mushroom mulch. My last load was $475 for one of those huge dump trucks. They had to get rid of it, so the biggest cost was fuel and the trucker's time. That load lasted 5 or 6 years. I do have folks who will let me get horse, cow and chicken manure, but I never get around to getting a load.
Here on the Sandhill I use grass clippings in the garden. It helps, but I still get jokes about growing on the beach when I post garden pictures. I've been planting loblolly down at the riverfield all week. (I got in on the hurricane recovery block grant, and I have to replant 25% of a stand, that is at least 125 trees per acre) The dirt is really dark and will stick to your dibblers. I came across several of my old patch spots. Plenty of sun, but not much cover. Give these seedlings 3 or 4 years to get head high, and I may give it another go round.
