"Each would be worth $1.50 in walmart"
This is stoneground flour produced in small batches which will almost certainly be sold at a premium price. Flour in the UK is commonly sold in 1 or 1.5kg packets in supermarkets and this would be priced anything from £2.00 to £4.00 ($2.5 to $5 / €2.3 to 4.6)