You can get sticky barcode labels printed for your barcode, which can then be manually stuck onto your product.
Unfortunately this is not a service that we offer in Singapore at this stage. Hence you should talk with label printers in your area. They should be able to arrange this for you with little difficulty.
We have talked with the below companies and been assured that they are fully capable of printing stick barcode labels in Singapore – hence, you could talk to them, or talk to another company in your area.
Union Labels can provide labels in various sizes at reasonable prices. They can do custom dies to cut labels to your preferred size, or you can use a standard size for labels which would be more economical.