There recently was (and maybe still is) someone on preloved selling miniature Herefords. They are apparently bred from standard Herefords, registered with the Hereford Society, and allegedly breed true to size, and have the laid back character of the traditional Hereford. So, on the face of it, a pleasant animal to keep, that will not overface you with meat when slaughtered. However, there was no price which suggests "expensive". And no matter how rare and exclusive they are, you can still get a run of bulls for which you will get very little in a commercial market.
However, you can achieve something similar by crossing a short legged dexter with a Hereford bull. Maybe not quite as small. But then you're not paying inflated prices for getting in (as mentioned) at the top of a pyramid selling scheme.