Hello!
The lowest tier of my subscription has products that fit in a normal envelope, so the cheapest option by far is to mail it via USPS with the typical 49 or 71 cent stamp (not a shipping label). Stamps.com for example will let me print the 49 cent postage from the computer. Is there a Shopify app that can do this? Stamps.com has an app but it doesn't specify this. Thanks so much in advance!