If you are near the Canadian border and can use an address in Canada, there is some clearance Alumilite at -
William Wood-Write Ltd..
There might also be some at
Bear Tooth Woods - was a couple of weeks ago.
You could also ask Eugene Soto .... IAP name ElMostro
Oh ... just realized that you might be wanting Alumilite resin for casting, not the finished blanks ... please let me know.