That's right the information provided here doesn't work. 

yea, at the cost of several hundred dollars a year- and most of the crappy apps you listed only have a 7500 product limit so not really helpful. Shopify should just remove the limit for free instead of making users rely on expensive jenky third party...

Apparently not. Shopify wants you to pay for some garbage apps. Just raise the limit. Wish I would have known this before choosing shopify, I would have gone another route... 

Here it is- just go to your normal theme editor (not code).  go to product --> default product--> in the template section hit add block, select </> custom liquid. Enter the code {{ product.variants[0].barcode }}  

I need a way to show the product barcode on the front end product pages of my website. I do not want to display my SKU numbers.  Does anyone have any experience with this and where/how to edit the code?