Polabel
When stock arrives, Polabel turns the purchase order into a sheet of barcode labels, so you can label each unit without typing the order into a label tool.
Pick a purchase order and get a label for each unit ordered. Change any line's count before printing.
Each label carries the variant's barcode (EAN-13 or Code 128), or its SKU when there is no barcode, with title and price (barcode and SKU only on the small Avery 5167).
Avery 5160 and 5167 sheets or 2.25" x 1.25" thermal labels, as a PDF your browser prints.
Install Polabel from the Shopify App Store, then open it from Apps in your Shopify admin.