I looked everywhere for that list of chanting price suggestions but could not find it.
I have 2 lvl 300 chanters and have found that I make more money just selling the DE mats. But, selling the higher end chants can make some nice money as well.
High end chants like: Crusader, lifestealing, +15agi, +22int, etc. prices change depending on server and if they provide mats or not. I never carry mats, I always have the person buy them.
Generally I ask around, I ask other chanters how much they sell them for and I decide from there. Usually I give low lvl chants for free and most of the time the person will tip me.
Some of the suggested price lists I have found simply took the cost of the mats needed for the chant and took 15% of that and used that as the suggested price.
The price of chants are highly variable so I would stick with what other people on the server are selling it for.