If your soil is nice you dont have to buy and pack in soil.
All you do is make up a Pre-mix of organic amendments and you mix that in with the native soil.
I dig up a 5 gallon hole and add about 4 cups of my organic pre-mix. Then mix it together on a tarp and dump it back in the hole. Then I mark that hole with a stick. You should not plant in a fresh hole because animals will dig. And the organics needs time to cook. Wait a week or two then plant the clone or seedling.