Free ring sizers have been “a thing” since I started HIF, but 99.9% of them are usually nothing more than flimsy slips of paper. However, this Blue Nile will send you a free physical plastic ring sizer.
This will go perfect in my kitchen junk drawer! My scissors, over mitts, dried out Sharpies, and loose rubber bands that haven't been used since 2008 are excited to meet their new friend.
Update: Helzberg is also sending out a free ring sizer. They say you can expect theirs in 10-14 business days.