It's my understanding that Detonics USA sells only through the distributor system. No direct sales to dealers. If your favorite dealer/FFL holder buys one through Ellett Bros, or RSR, or Davidsons, and only tacks on the 10% you mention, the sticker price to you will likely be well under $1100. Can't help you with the taxes though. Depending on where you live, that just might take it up to $1100. Such is life if you want one NIB. Good used stainless models from the old factory seem to float around for about $550 to $600.
Good Luck, ...Deeton