So the latest sale info (in USD)
Stage 1 - $3.99 for 300 supplies
Stage 2 - $6.99 for 700 supplies
Stage 3 - $8.99 for 800 supplies
Stage 4 - $9.99 for 175 researchers
Stage 5 - $39.99 for 1000 supplies and 200 benefactors
This is the total supplies cost to move an artifact from 1* to 5*
Thanks for the heads up Quali.
So if you're one of the lucky 1-in-8,000, ie. you've managed to craft three 11%s on the same artefact, but you can't wait to earn Museum supplies the slow way...
Stage 1 - $3.99 for 300 supplies = 1.3 cents per supply item
Stage 2 - $6.99 for 700 supplies = 1 cent per supply
Stage 3 - $8.99 for 800 supplies = 1.1 cents per supply
Stage 4 - $9.99 for 175 researchers = 5.7 cents
per researcher
Stage 5 - $39.99 for 1,000 supplies = 4 cents per supply (but you do get 200 benefactors also)
I'm assuming most folks have lots of researchers and benefactors available, because they don't have many (any?) artefacts that have been worth upgrading to level 4 or 5 yet...