This Zigbee I/O with 4 Inputs looks great

[Hatallica]

Maybe contact them directly regarding sales channels?
info@develcoproducts.com

Another option - albeit not as neatly packaged - might be:

Thingshield replacement for arduino over zigbee now available for hubitat

I recently developed a replacement for the old ThingShield that used to be available for SmartThings. It lets you send/receive arbitrary commands from an arduino, over zigbee. See here: I'm happy to say it now works just as well for Hubitat! Here is the driver code: I have some available to try out now. Just private message me on this forum if you'd like to get one (or more) for a $15 donation (each).