I haven't found their free shipping offer anywhere else, except on the front page... And one has to order 6 of those kits, or add other stuff, to make the minimum order amount to qualify for "free" shipping.
Not too bad a price for extract kits, and they can be modified/enhanced... All LME-based, though.
Just to test it out, I tried to put some of those kits in my cart, but... my cart stays empty!
I guess I'd need to log in first, (and create an account) which is not inviting for (potential) customers or to hook a casual browser.