Saltwater sportsman's catalogues have them, but I don't know how small they make 'em.
You may not be able to find anything that will crimp less that #60 lb leader material.
I usually make my leaders at home, on my workbench. I have them stored and ready to go when out on the ice.
It saves me time and aggravation of trying to tie when my fingers are cold.
Hope this helps,
Wiener