So, I just made a trade deal through PM for one of myy unpostable books.  I remember someone saying that you can use Custom DC to print out a abel and DC barcode.  But does that include postage the same way printed postage does? 

I searched around in questions and the help section and couldn't seem to figure it out.  Thanks in advance for the help!

Yes. You can access it on the book's description page. Next to the book's image, click the "more options" tab and click "Mail-to-a-friend"

You'll be asked for the person's name and address, then you'll be taken to the same label print page that you'd get with a normal book transaction.

Custom DC lets you print the DC, but not the postage.  Mail to a friend gives you the standard label options.  Custom DC lets you select Priority or First Class.  Friend switches to Media Mail by weight.

Friend also removes the book from your bookshelf.  Great for deals as I usually forget that step.

Got it, so I don't want to use the Custom DC, I want to use the mail to a friend option instead.  Its a good thing I asked or I would have messed that one up lol.  Thanks a lot!