Unfortunately metal prices have gone up- sucks, but that's just how it is, sadly.
Thing is, Iron Wind Metals... well, that last word says it all. They don't do resins or plastics (the resin dropships were a third-party that handled that end of things, and it didn't go well apparently). This is their business- pewter.
As for the plastics, I have hope that we'll see more like them, but the fact that it's been as long as it has been since the Thor and Loki with no news since isn't a great sign, unfortunately.