Try calling around some beauty supply stores in your area and see if any of them stock Tend Skin. Also, maybe you can call or e-mail the Tend Skin company and ask if they can give you a list of retailers?
By the way, I have some mild keratosis pilaris. It goes away when I moisturize well with rich body creams (as opposed to lotion). You should be able to find medicated body lotions with lactic acid or urea at drug stores that will help, too.