Your record will be mailed in a record mailer box with a cardboard stiffener. Record will be mailed outside the sleeve to protect the record. No pizza boxes used here. I have many records and I have volume pricing set up for multiple purchases. See the record part of my store here: https://www.ebay.com/str/mineisyours22/Vinyl/_i.html?store_cat=3678671201.
Shipping covers my cost for Media Mail at $3.92 + Record Box + Stiffener.