When I purchased it was only sold at his home for idelogical reasons, didn’t want profit seekers. I believe you will have to purchase by Reb Chayim his son in Bnei Brak. I’m not sure if they will sell an entire set, since the Steipler was against that as well. In favor of purchasing what is necessary for what you’re learning presently. Take the 400 bus, and get off at Ezra before Chazon Ish, and walk to Rashbam.