I found with all of M's suppliers that they wanted us to make selections and then they would give a price. Trying to get itemized pricing or a price list from anyone was next to impossible.
If they were more open about what each option cost we would have been able to make informed decisions.
We went with a pretty basic staircase as we had no ideas what it would cost. Our choices were actually cheaper than we expected. If the stair company had given us a price list we may have actually spent more on the upgrades.