Hello!! I'm a USA-based backer, and I had a question on how pledging works. I don't see any tiers that say anything about USA shipping or "flat mail only". I chose the "Build your own order" tier and added on only stickers, and USA did not show up as a shipping location option even for just that (I've chosen "United States Minor Outlying Islands" for now in order to pledge and comment). I initially also added on a few pins, and assumed that the USA did not show up as a shipping location during that attempt because the pins are too big for flat shipping, but then flat shipping and USA location still did not show up when I just had stickers in my add ons. Just a bit confused, and hoping you can help! Thank you, have a lovely day!! <3