Signed copies of Summerworld are in very limited supply! They have been going fast since they came back in stock.
Also, this is the last printing of the priced-down version. After this, I will be issuing a new trade paperback edition (6"x9" format), for $15. This is the next step towards creating the ISBN / barcode edition, which will be in that size.
I'll have copies of the new 6"x9" edition at AnimeFest when I go there later this month.