Tomence,
You noted: "Grimco and Advantage was offering me the L26500 without the 3K rebate for $15K, actually Advantage was little bit more expensive like around $16K and they were telling me that Grimco was selling that printer at a loss to gain my business of buying supplies."
As long as you are sure that Grimco or Advantage is not taking the "rebate" themselves,
then you are buying a printer from an reseller at a "loss lead".
My only comment here is shame on HP for allowing this to happen in their sales channel.
On the other hand, Kudos for the enduser as they are getting what I consider to be a great printer for a heck of a deal.
Bob Gruner
NusignSupply