I ordered some 9.5CM, round, outdoor stickers, with the bitcoin logo. No text whatsoever. With UV and weatherproof (outdoor) coating.

Ordering: Use this shop, and pay, after sending I delete your address.
Paying: Bitcoin Lightning and onchain are supported.
Sending: Envelope for 15 sticker-packs. Cardboard box for all the rest. Both should fit in your mail slot ;).
Disclaimer: I try my best to send within a day or two. For larger quantities I weigh the stickers instead of counting, so there can be a slight difference in amount. And I must ask you to only place stickers on your own property.