I just spoke to Bill Fauver on the phone.
He broke down the $877 for new custom skates (without blades) fit using an STS cast price more: $849 for custom skates, plus $28 more for the STS cast kit when ordered with boots. That's the whole price for the boots if you are fit at the factory - which many of us would assume to be best, though you have to add in travel time and cost. If you are instead fit at one of their designated orthotists, Avanta pays the orthotist's fee.
Also, the blade discount from standard retail when bundled with reasonably high end new blades is $150-$200 - the most at the highest end - in line with what OmegaGMT cited.
Note that at this time, the last is not molded directly from the cast, though they are looking at ways of doing so in the future. (They still use some leather, which means they need a strong enough last material - I think he said they take standard lasts and modify them by sanding them down or add pieces made from something made by Bioform, to make you an individualized last.) I think they take measurements from the cast. That's probably better than letting a third party take measurements, and gives them an opportunity to get everything right if questions arise. It also lets them look at the orientation of the leg if they want to make sure the tilt of the bottom of the feet, because the cast covers part of the leg. Plus, having your own permanent last may mean that future boots will fit almost exactly the same - if you don't grow or change your shape. In contrast, custom boot companies that do temporary mods to lasts, then re-use the last for the next customer, give you slightly different boots every time.
Everything he says shows the company is committed to future innovation, but that the people involved, including Will (Bill?) Murillo and most of Klingbeil's bootmaking team, and soon, Don Klingbeil, have a strong grounding in the skate boot making business. I love what they are saying.
Like Klingbeil used to say, they will not add extra cost for other boot options.
The price sounds quite competitive for what they are delivering, when compared with other custom skate boots.
Those who are getting their skates from them - I'm sure we would love to hear more reviews of completed boots.