Search for landrace indicas. They will be pure indica (but only if a photo as @Myfriendis410 suggested.) Autos are crossed with ruderalis, which is neither indica nor sativa.
GDP (photo) is 100% indica, but when you introduce ruderalis to create an auto, you can no longer claim that it is 100% indica. It is then also some % ruderalis.
That said, if you want as close to 100% as you can get with an auto, then GDP will be a good choice. Just be aware of the difference.
I think they can say 100% indica because other then the ruderalis ( which is neither) there is no other breeds mix in. Most autos seem to be a mix like Strawberry Nugs and Gorilla Glue (which is a totally awesome auto to grow with a sweet flavor and high thc).
I would too, and was planning on buying some seeds. But I wanted to make sure this wasn’t a misprint or error. I enjoy Indica, but never heard of a 100% auto Indica.
Fastbuds has the afghan kush. I think it’s listed as 85 but I can tell you….its definitely more indica than any other autos I’ve grown and I grow indica mostly. I just has a different structure and a very rich green color. It’s getting fed by same res as other plants and it’s just old Mountain Dew bottle green. Close second would be Mazar auto from Dutch passion.