Theres a few player owned bases that sell ore around, or just buy some cheap cargo off Scarsborough Station. Just make sure its not a POB commodity- you can tell them apart since they sell for the same price everywhere. Iirc Scarsborough sells Super Alloy? Most non-house specific resources have decent sell prices in other houses. Ie Rheinland doesnt need Kyushu Rice, but does need engine components and optronics from Kusari