If you check the yellow pages for places that sell chemicals, you might be able to find one with lye, I can get 50# for $60.00..
I pay $42 for a 50# bag of lye from a chemical house and I only needed to show my resale license. They do record my car license when I pick up my lye. Chemical houses are a great resource for lye, but only sell in bulk, at least any I have called