are you after the bars of steel or a semi finished blade that you can fit your own handle to?
I sell both as well as the guys above, but obviously my blades are a different style
A lot of folk get their O1 from Cromwells, since they carry a huge range of sizes. Unfortunately in this country it is nearly impossible to buy small amounts of any steel other than O1 and silversteel, unless you can persuade a maker to sell you a little. In which case there are other simple steels that are easier to forge and heat treat, but O1 is a doddle to grind and comes in a packet with HT info (crude, but there).