http://www.amazon.com/gp/aw/d/B000FMYFVI/ref=mp_s_a_1_1?qid=1422822463&sr=8-1&keywords=o1+tool+steel&dpPl=1&dpID=31xGT3DXKzL&ref=plSrch&pi=AC_SY200_QL40
Flat stock, standard tolerance. It is also shipped through Amazon.com, so you can use prime.