First Trax is the only one. They have a small shop across from the Jay Country Store and their main store is in Montgomery. If you're getting skis fixed and don't want to buy product, the guy's in the Jay Peak repair shop (tram side) are really good and do work quickly.
Here's a link to their Montgomery location: http://maps.google.com/maps?f=q&source=s_q&hl=en&geocode=&q=first+trax,+montgomery,+vt&sll=32.402072,-86.32199&sspn=0.345525,0.535583&ie=UTF8&cd=1&hq=first+trax,&hnear=Montgomery,+VT&ll=44.880201,-72.59697&spn=0.138909,0.267792&z=12&iwloc=A&cid=3071086887935365403
Here's their Jay location: http://maps.google.com/maps?f=q&source=s_q&hl=en&q=1078+Vermont+242,+Jay,+VT+05859-9694&ie=UTF8&hq=&hnear=1078+Vermont+242,+North+Troy,+Orleans,+Vermont+05859&z=16&iwloc=A
It's not that you can't ski ice. It's that you can't ski and the ice proves it.