Thanks to RH for letting me know you can submit your Walgreens rebates online! I had no idea this was possible. (I can’t remember if someone else mentioned that, too. I tried to find another comment with that suggestion, but I couldn’t. Sorry for leaving you out, if I did!)
You’ll enter a unique code from your receipt to show that you’ve purchased an item that generates a rebate.
It saves a stamp and saves an envelope. Gotta love that!