Can I still get the $1 Marvel Unlimited deal?

I recently signed up for a month of Marvel Unlimited, and I haven't been charged yet since I'm still on the free trial.

Right after signing up, I noticed there's a deal for one month for just $1, but I didn't redeem it.

Is there any way for me to use that offer now, or am I out of luck because I didn't redeem it when I first signed up?