I don't know if you still need the help on price checking, but I am trying to give you some advice. I don't like over priced stuff so I hope my opinion fits yours.

Iron Fillet - 1k
Aluminum block - 2k
Hard Aluminum plate - 10k-15k
Aluminum plate - 5k-8k
Steel - 5k max
Coal - 500g-1k
Mercury - 10k-20k
Copper ore - 150g-300g
Crude Oil - 500g-900g

I took it by the average prices, Aries gold rate, materials difficulty to obtain them and manufacturing effort.
So no hate, just my opinion and calculation.