I'm not saying this will work...but maybe...
A few months ago there was a Gatorade offer that had similar wording of "per day". I bought some the first day and the coupon was gone...a few days later I bought some more Gatorade during my normal shopping and the same coupon applied itself again even though it was no longer showing in my list..it continued to work every time until the promo expired.

So hopefully someone can try another 100 today after they used the original coupon a previous day.
I used mine yesterday and will be trying again this afternoon in about 5hrs from now...but maybe someone will beat me to it.