It's easy to make a jig to make these tops accurately yourself with a router. Watch Timothy Wilmot's bench video on YouTube...a simple tee-square with 30mm holes spaced at 96mm increments down the centerline for a 30mm guide bushing and the "tee" being the exact width to put the centerline from the previous row exactly 96mm over for the next row. You set it up to start 77mm from the corner in both directions. A 20mm router bit is relatively inexpensive, too.