If your looking for new, then yeah it looks like the Happs one is it.
If you go used, then there are the SNK LS30s that were used on Ikari warriors, These had an octoganal shaped top. The Data East games suh as Heavey Barrel used a similar stick but the top was more smooth like a cylinder. I had a heavey barrel and these joysticks seemed to be very similar to wicos and used the same centering grommet. There also was a wico rotary stick that had a ball top, very nice.
Remember you will need a rotary interface board for using in Mame.