I believe they were around only in the late 1980s. The second edition of Macintosh Bible raved about them but the third one said that the company was filing for bankruptcy. Bible #2 came out around 1989 and #3 in 1990-1991, and since they were Mac-related they couldn't have come along any earlier than 1984, probably more like 1986 if they entered the SCSI market.
Also, on the old computer catalog subject, I got some Mac Warehouse "best of" lists in the copy of Print Shop I got today in the mail. These were circa 1993.