Those are very cute. Definitely a tiny business lol. Just about perfect for mobile life in a mobile space for a physical product.
You mentioned you buy shipping through Etsy. Pirate ship can connect to your Etsy and import the shipping info to your account with them. I did this for eBay and saved decent money.
Everything is done on your computer, so you don't do anything different. Just print from pirate ship instead of Etsy. It might be worth checking out. One thing I did like about doing this is that the shipping labels are saved, unlike eBay, which would delete them after a certain time period.
$2 difference(?) Per package might or might not be worth it. But for me it was simple and didn't take any extra time vs buying shipping labels from eBay. Bigger or heavier items definitely benefit more in terms of savings.
Regardless, I love your product, and at some point I might order some for family.