Yeah I'm about 2200 mi east of you and it's about 40 bucks for a 3 ft bag. Thinking about getting a bag or 2 of that maybe mix in some pro mix HP add in a little worm castings that should get them started at least and then amend with my Roots organic dry amendments after a few weeks.Might downsize to 20 gallon containers because it's not a problem getting water to them.
Sounds like a good plan, $40 a 3 cu. ft. bag isn't a terrible price, most grow places sell the 1.5 bags for about $30-$35 a bag. A couple years ago, I was getting the 1.5's for $9 a bag, but inflation ate that up. The place I go is a bulk soil distributer, with a small grow shop, they have 50 plus different brands and hundreds of pallets of bagged soil.