New Denon 5910 for $1799?

I have found an authorized denon dealer who has 4 new unopened Denon 5910 in black where they had them marked $1999. This caught my eye since I have seen them advertised new on EBay for around $2900. Upon closer inspection of the sale tag it appeared as though they had actually been priced at $1799 where the 7 had been changed to a 9. I inquired and was told the accountant made them mark them up. However, if I were interested they could do $1799. Question? Should I buy up all 4 of these and sell 3? I am not out to make a killing. Rather I see this as a possible way to end up with a 5910 for the cost of a 2910/3910 if I were to sell the 3 for around $2300 each.

What is the selling price for new 5910 here on Agon. $2300-$2500?

I also have read there was a new model "ci" which has 1080P. If these are original 5910 can they be easily updated to 5910ci at no charge?