I haven't seen the lye version sold in the kit form.
However, there are some sites that sell all the necessary products you need if you purchase the lye relaxer.
I recently purchased from BeautyClicks.com
They were EXCELLENT; speedy shipping
had everything I needed
I believe Sheldeez.com also has everything you need.
There's one more that I can't think of right now...
Oh it's www.irbysbeautysupply.com/Affirm.html