Sweet! Thanks for the heads up. If I remember correctly I made two purchases last week, one Tuesday and one Wednesday. Unfortunately Wednesday's purchase didn't cross the $50 mark but Tuesday's did, so I'm gonna look into how to submit this tonight.
GamerDude316 is right in his comment below. Doesn't have to be one purchase, just has to add up to $50. Everyone who has signed up through me previously is also likely to end up qualifying for the Team bonus this month too thanks to this so that's an added bonus.
Each purchase doesn't have to be over $50, that's just your total to get by the expiration date. So you can submit both of your purchases.
Also last time they had this I got store pickup receipts to work, YMMV though.