It could just be that album-quality aside, an "Ultraphobic" cassette (!) is probably way harder to find than a "Cherry Pie" or "DRFSR" tape. Not only cuz Ultraphobic sold far less than those other two in general, but also cuz by the time that album was released in 1995, cassettes were on the way "out" so there probably weren't many released in that format.
I mean, geez, I started buying CDs in 1992 and even then I felt like I was late getting on the band wagon.
Hey, now, I got my first CD in 1992. I was only 5, though.