Lye can be purchased from a number of online stores including Bramble Berry, Camden-Grey Essential Oils and the Boyer Corporation, as of 2015. Most people use lye for soap making, and these retailers sell lye in a number of different sizes, including bulk sizes.
Lye is also available from chemical supply warehouses, but usually only in bulk, so it may be useful to get to know other soap makers who can share the cost. Lye can be stored in an airtight container but must be stored away from children and pets. It is available at hardware stores, too, but people are advised to ensure that the product is 100 percent lye before purchasing it.