Well I asked their support thingy about using PayPal (don't have a credit card, but I'm verified) and if I am able to buy NBA Live 07 using that somehow.
Wow, they replied just like they said they would. Wasn't expecting that (not bashing EA, but customer service is usually a weak spot in companies)
It turns out I can use PayPal to buy the game from EA.

I will probably use that...but I am first trying to find where I enter the $15 off.
Edit:
I clicked the Purchase button when trying to buy the game (after I went through PayPal verification and agreeing to EA's Terms of Service), and there was a page titled "Address Messed Up" and some information about it. So now, I sent another support message.