Host is from Web of Horror, but that doesn't necessarily mean the story appeared there. I got nothin' else, Cap.
Yeah, it's the essence of obscurity. Kaluta drew it for WoH's fourth issue, and they folded after three. I'll explain soon
Okay, I think I know that one. It's from the first issue of a fanzine called Reality from 1970. I don't think it has ever been reprinted in English, so if you don't own an actual copy of Reality 1, you probably got it off the net from Mr. Door Tree's Golden Age blog while it was still up, or from the fanzine page on Ken Meyer Jr.'s Ink Stains (where he tacked it on to the second part of the story when he reprinted Reality #2).
You definitely get the Cap'n's non-prize, as it is from both Reality #1 and Reality #2 (the publisher of the fanzine, not Ken, reprinted the first four pages of the story so as to present the entire story in one issue). Ken has a great fanzine site, but Reality #2 is actually still in my hot little hands