Yes, I have one of those over there (pointing towards a corner of my stamp office). Part of the cost of selling the stamps was obtained by selling the advertising space on the booklet covers.
Now don't confuse your privately produced and privately vended booklet with the USPS "official" makeshift
booklets assembled with non booklet pane stamps. Placed into a folded cover these two were vended but in the post office. The covers were generic meaning they were independent of the stamp design included, however a white space was included for adding issue specific information and cost.
If you search eBay
with the key word makeshift your should find examples. At one time early in production, they were mentioned in the Scott US Specialized booklet section. However, I have not kept up with modern booklets to say if such information remains in Scott and if all of the designs used to produce such vended booklets are listed.
Edited to add images:
Note hole in cover to show stamp design included.