Slave Labor Expands Download Effort Slave Labor Group has apparently expanded their downloadable comics initiative with promises of more to come. The latest enhancement includes more titles but perhaps more significantly the addition of PDF format and the availability of a trade paperback's worth of comic books via Andi Watson's Skeleton Key Volume 1: Beyond the Threshold, which I remember being appealing work. The Watson book is $1.69 for six issues' worth of comics; the stand-alone issues are going for $.69.