How about making your own barcode?

http://www.barcoding.com/upc/
The barcode type is supposedly "Code 39"

Get an image of a legit sticker, break out Photoshop, insert your proper barcode and other specific info (if any), print it out, get a clear sticker and stick it on. If it scans correctly, no one is going to look at it twice. You can test the scan with your smartphone, I just used "Red Laser" to test reading it on my truck, no problem. It even identified the barcode type as "Code 39".