It's a Charles Craft Baby Alphabet Afghan, with 26 blocks around the border for the letters to go in. The whole things measures 45" x 41", and each of the alphabet blocks is 3.75" square. The fabric is a 100% acrylic 18ct, which can be stitched over one or over two. It's still in the original unopened plastic, as I unwrapped only one of the two to see what it was like.
I've been looking around on the internet and these go for between £14.20 and £17.57 in UK shops, or between $20.59 and $23.90 on US ones, so I was thinking of £10 plus postage (possible Large Letter, otherwise a lightish Small Packet) for this -- but if you've got something interesting to swap, do let me know and we might be able to arrange something!
