: You must fill out Form 3800 (the green sticker) at the counter or pick them up for free to use at home.
: If you use Priority Mail, the Post Office provides free envelopes, but the Certified Mail fee is an additional charge ($4.40 as of early 2024). 2. Online Postage & Software Services where to buy certified mail envelopes
For businesses or individuals who mail frequently, online services sell specialized envelopes that allow you to print barcodes and tracking information directly from your home or office printer. USPS-Approved Certified Mail Envelopes : You must fill out Form 3800 (the