1) No. crunchyroll.com, if you've got a high-speed connection, streams copies of them. The first story where the Medicine Seller (the guy pictured above) appears, however, is in the third story arc of Ayakashi (http://www.deepdiscount.com/viewproduct.htm?productId=19955032), which *is* licensed and available, but is by Geneon, so if you want it you need to get it ASAP. ETA: The first two story arcs (and DVDs) are self-contained, from what I understand, so you only need to get vol. 3. It is apparently revealed in Ayakashi that the Medicine Seller keeps shunga pictures in his medicine chest. XD

See why I kept emailing you "Biwa-strumming demon fish!" earlier??? :)

2) No. :) ETA2: But there *is* manga in Japan! Check the comments on the post I linked! (I think it's based on the anime, rather than the other way around.)