Ok, I was told today that there is no MSRP for the toner, however I was able to get dealer cost and confirmation that the stated yield is 21,500 pages.
I'm going to double the price for the MSRP, thus the cost would or should be in the area of $187 per cartridge. Which means based on 5% coverage the cost per page for toner only is .00869
I also needed to do some research on paper cost. I'm going figure in 35.00 per case since the erasable system should be placed in colleges, universities, K12 and maybe some government. At 35 per case with 5,000 sheets the cost for paper is .007 per sheet.