Because there is so much misinformation on the upgrade costs on reddit and so on I feel I have to post this to get everybody on the right path. You copy the spreadsheet and type in your material you already have and put in the current market prices. Now you can see the missing material and the price it would cost to buy them on the market. If you are already at for example true siren weapon just delete the materials above. We confirmed the materials ingame and they should be 99% correct.