If you ordered $1,300 worth of products from them in the last few months you almost certainly know they have an email address. More on reddit.com

I personally get my boxes, at $0.14 cents per unit from my local box manufacturer . Search box manufacturer near you, and buy in bulk from them, i'd bet they'll give you the same or better price you get on uline and without the shipping cost More on reddit.com

just something to keep in mind... the owner of uline, who lives in illinois, spent millions of dollars in ohio to take away womens right to choose. i stopped buying anything from them. More on reddit.com

For my 6" x 9" hardcover book, I use ULINE S-11215 mailers and two 12" x 12" squares of Duck bubble wrap . If you ship via USPS Media Mail, you get a tracking number, and it shows up in 2-8 business days. For my book, which is about 2 pounds, the whole thing costs $7.22 to pack and ship -- $1.61 for the mailer and bubble wrap, and $5.61 for the USPS shipping (after the recent rate increase). This is kind of a premium solution, though :) It's thick (1-2 layers of cardboard and bubble wrap on every side) and waterproof if you seal it well, but it's expensive and time-consuming. I do it because mostly the only people ordering my hardcover edition are friends and family -- strangers buy the paperback or Kindle versions! I've noticed that online booksellers who drop-ship my hardcover directly from IngramSpark use "UPS Mail Innovations" (where UPS hands it over to USPS for economy shipping), which has a tracking number but seems somehow cheaper than USPS Media Mail. They ship the book in a stiff paper package that gum-seals around all four sides in a wide flange, kind of like a giant ravioli. The envelope has a thin layer of plastic on the inside, not bubble wrap but a slight bit of extra protection. Based on the price they're charging for the book, my guess is that this costs them maybe $6.00 all up. But this option seems to be available only to large customers. For reference, if I were to order a single copy of the same book from IngramSpark myself, and have them ship it to my customer, they would charge me $9.69 for the shipping, though this presumably includes some handling charge as well. They charge $17.39 to ship a carton of 12 of the books, which works out to $1.45 per book. So I order them sent to me by the carton, then ship them to customers myself :) More on reddit.com