Iso 1980-1987 chevy c30 crewcab long box frame

Would consider a k30 frame for the right price, but im looking for a c30 or k30 frame for a project, already have a k30 single cab, but looking for a frame to stretch mine into a crewcab, must be a 1 ton frame, no cab and chassis. Not looking for axles, or a body. However if the price is right id buy them too