https://comicstore.marvel.com/Superi...al-comic/33015
Is where it's at.
Add it to the cart, type in SPIDERFANS under promo codes and it should be free.
If you don't have an account on the website you'll need to make it, if you do than just log in.
Enjoy the start of the Goblin Nation!
I already have a physical copy but it doesn't hurt to have free Digital one, I guess.