FYI, as per the red sticky thread at the top of the Book Bazaar forum, magazines can't be offered for credits. They can be freebies or incentives though.

Happy swapping!

(3) No selling books for anything but credits, and no offering anything but books for credits. Freebies/incentives can be "unpostable" and "unswappable" items, but remember that non-Media-Mail eligible items CANNOT be sent using Media Mail postal rate. For example, DVDs and VHS tapes and magazines and pamphlets/booklets without ISBNs are all NOT permitted to be posted at PBS; they can all be offered as freebies/incentives, though. But if the freebie/incentive items contain advertising (ie, magazines or booklets bought at a supermarket checkout stand), or are not Media items (anything but books, CDs, DVDs, VHS tapes) they can't be sent Media Mail, so the whole package will have to go by another shipping rate. DVDs/VHS tapes/CDs can be sent using Media Mail postal rate.

Merry ann, as the rule Sophia has pointed out states, magazines cannot be swapped for credits on PBS. You can offer them as a freebie/incentive with a request of a BOOK, but you cannot ask for credits for magazines as they are not swappable on PBS. You can also find this in the Help Center under "Is my book okay to post here?"

Is my book okay to post here?

These are great magazines -- you could offer them free with an order from your shelf, as long as you didn't send the package at the Media Mail rate.