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I see your south of me. There are several places to fill you tanks. Here is a link for NOS brand filling stations. Scroll down to MN you'll see several in MN. I'm not sure if any of the towns are close to Rochester. Call around because the prices vary quite a bit. Usually around $3 per lb. http://www.holley.com/HiOctn/ProdLin...S/NOSlist.html