Hmmm!
Print run is small. We meet demand each week as the orders come in from the website.
Advertising? Thats a difficult one.
Advertising for money? No probably not.
The whole thing is being done for cost pretty much, actually generating money would change the feel of it a bit and also make it answerable to the people who bought advertising. As it is, it is purely a hobbyist and purely for the fun of it endeavor.
Free advertising, you know, reciprocal stuff would be a different matter. All retro goodness supporting each other, that sort of thing, then yeah.
In the shops? That sounds interesting, but for the life of me i cant imagine making that actually work. Interesting idea tho.