Strange though that they do not tell in the text precisely what films are inside, instead having us enlarge those product photos to see the designations (Delta 100/400, Ektar 100, Portra 400).
(end of grumbling mode)
Those hardcore 9mm film enthusiasts did not need to wait for that offer, converting their films themselves.
Keep remaining those who want to use those cameras for some fun, kind of photographic luxury, likely not exposing too many films. I think for them the price is reasonable.
The Delta 100 stuff has been out since February, I got two rolls at the end of that month. I'm very slowly working a roll through my Minox B, but as one who has migrated most of his film work to medium format, I do find the microscopic size and non-microscopic pricing a bit offputting. I bought the camera new during a weak moment in 1963, so I want to at least try a couple rolls of "modern" film to see how it does. It had been buried in the back of a closet since the 1970s.
Note that if you opt for B&W prints, their low-cost prints ($0.69 ea) are sepia-toned. Not bad, but something to be aware of. Their website has plenty of information related to their processing plus examples.
Sharan Minox film is also available via *bay. They have Acros100 and a colour film (presumably also a Fujicolor film). I have bought from there, partially to get the new cassettes, and it works fine. Pricing was five rolls for USD90, though they also sell single, two, five or ten rolls off the page and are 'open for discussion' for larger quantities.