Possibly Zygolum Rhein Moonlight (Zygosepalum labiosum x Zygopetalum Arthur Elle), often incorrectly identified as Zygopetalum Rhein Moonlight, and frequently seen in mass market distribution. Could be similar breeding of course, but that's the general type, not "pure" Zygopetalum. Zygotoria (Pescatoria x Zygopetalum) hybrids can also be quite similar.