I made my own dirt the 1st two years, now I make compost and dump it in the gardens in fall with leaf mould bags, it makes dirt too Only bought 4-5 bags of premium so over the last few years. I also look for free dirt on craigslist and often its spent garden soil! Perfect because I have creatures! I can add poo and compost and all sorts of things to make it amazing again.
For dirt to fill 3 to 5 temporary raised beds (depending on size)
I Buy one bag of great soil, fluffy-high in nutes. One large bag of sand, coarse. Add clay chucks from the ground on the property broken up (about 5 of those same size bags worth. I dump loads of rabbit waste into it, about half a bag of chicken old bedding, and a bag of leaves from the yard. I turn this and turn this and then plop in my make shift raised beds (pallets), plant my lettuces, broccoli , cabbage, chards, mustard greens in them and have a instant garden.
The mix I use makes 4 pallet gardens on ground or 6 pallet gardens upright.
For ground beds
I bring them to the spot I want my veggies. I pull every other board out, use the board I pulled on the bottom for the gap below it and fill them well with dirt. Line my seeds and done.
Upright beds I used for herbs. Propped pallets against wall. Pulled every other board out and nailed it to the bottom of board below it forming a long box, dump dirt in and plant.
They last one season on the ground sometimes 2 and 2 or 3 seasons upright. They wood does deteriorate but there's plenty of time to get a few crops in.
I've seen vertigcal growing in catalogs not cheep. I have thought of trying pallets Ron always has some from bricks . I've seem them for free on hwy 59.