Some bank branches keep fastag. You can get instant fastag from toll plaza itself. There are stalls nearby toll plazas where they sell fastag. In my fastag app, there is store locator as well.
i was going to say the same as @coolguy1. Even dealers have unactivated fastags like a welcome kit.....but not sure if they will be convinced to sell/give it to existing car owners (and do the hassles of activation)
Just one caution: If you buy a tag from a person near a Toll Plaza, make sure they create a fastag with the correct Chasis number, I had an impromtu travel plan made and had to purchase it near a toll plaza and the guy who sold me the tag input the incorrect Chasis number and I had to pay double toll throughout my journey because it was hotlisted.
I think u can buy fastag from Amazon pay directly... Amazon pay >> Daily Transit >> buy Fastag. It's Apay ICICI fastag. Icici tag is very useful. I don't know how amazon deliver the sticker.
I had idfc. Never faced problem.
Ask your car dealer but they have tie up to specific fastag provider. Ask them to give agent's number.
I think it will be available with some or the other bank branch or with a car dealer, won't it?