[jyl]

Call around, find a local bulk soil place (ask your favorite nursery for recs), have 1.5 yd of their planting mix delivered to a tarp spread next to the planter. Cost me $65/yd delivered, and I’m in an expensive city. If they only deliver whole yards or have a two yard minimum, you can always find a use for half a yard of good soil - top up existing planters and pots, spread on lawn, etc.