Talk:Void Relic/@comment-81.15.241.12-20160731171755/@comment-29381336-20160731215210

Since Hotfix 13 the prices are pretty simple: 15 ducats for common parts, 45 ducats for uncommon, 100 for rare (4th paragraph in the linked update notes).

I did put together a table with an ordered list of the rewards for each era and rarity (which i have on my second screen for eactly the reason you mentioned) and put it on a blog post, though you might want to download a local copy as the page has been queued for deletion.