Found a new Yaskawa/Nidec Nemicon RP-Y01-2Z1 remote pendant on eBay. The price was reasonable for what you get, which is a solid rugged quality pendant. I got mine from ebay seller, “shawnmetal”. He had more at the time of purchase.
These can be made compatible with Mach3 and Mach4 by swapping the internal controller with a PoKeys Pendant Core board from CNC4PC. They also sell the whole pendent, but it’s much cheaper to find an unconverted one and just spend the $60 on the conversion board. FYI, even though not stated the PoKeys56U board does come with the core board and is cheaper than a new PoKeys57U.
All the buttons are addressable and configurable via the Mach3 PoKeys plugin. It can also handle a forth and fifth axis.