Upload & Sell: Off
I ship a few prints out...enough that I order mailers by the pallet.
I used to use clearbags for their bags (insert liners to go in our mailers)
And I used to use Yazoomills for their tubes and another company for their mailers
But now I get everything from Uline. They have tubes, mailers, sleeves and custom printing as well. Plus, if I needed something anywhere in the US, I can order it locally for next day delivery (because they have multiple warehouses)
I am going to look into John's suggestion of packageprice as for quality and lead time, but with the Uline mailers, I've never had to use any additional backers for prints.
However, I do remember one customer calling to say her postman bent her print to put it in her apt box (even though we have "DO NOT BEND" stamped on the mailer).
She suggested we get some backing material, but seeing as that is one case out of ... say... 100,000 in the past 10 years, I think I'm better off saving the 55 cents per print and just re-mailing 1 every 100,000!
Logo printing would be a nice touch, but I wonder if nearly double the price for mailers is worth it. It's not like we're in the business of selling mailers nor marketing to mail carriers, but I'm torn between the value of having your name on the mailer that they'll throw away after they open it, and whether the name branding is worth it for the 10 seconds they look at it between mailbox and kitchen table (before it's discarded) Currently, we'll but our logo on the corner of prints, so our name branding lasts as long as the print, not the packaging.