I'm offering the first two books of Mary Stewart's Merlin trilogy, The Crystal Cave and The Hollow Hills, for one 1 credit.  They are trade paper and in good shape, overall.  The Crystal Cave is unpostable due to a small stain (about the size of a q-tip head) on the cover that leached through to the first couple tile pages, but not to text pages.  Color is slightly orange and almost unnoticeable--I paid a credit for it and didn't notice the stain until I went to read it months later.  Anyways, offering both for a credit, as the first is unpostable.  Just order Hollow Hills and send me a PM that you want Crystal Cave as a freebie.