Scrape EAN/UPC Codes from Amazon?

Hey,
I'm searching for a way to extract/scrape EAN or UPC codes from Amazon. I found that Product Advertising API may be the answer to my problem but it requires an active associate account that I don't have.
I need to get these codes to scrape informations about products on other ecommerce sources but here I'm stuck with ASIN that is only used on Amazon...

Any hint ?

Bump
So I want to convert ASINs to EAN/UPC codes but there is no viable converter out there. The one I had the most success with was synccentric, but it doesnt work with all ASINs and its not suitable with the volume of codes I need to convert.
Anyone using Helium10/JungleScout/AmzScout? I'm wondering if they show these informations.
Otherwise I'll have to make an affiliate site to get access to the API...