Was thinking about visiting here and emailed the hotel to ask about costs for airport transfer and an airplane tour of Everest. I got this response, in case anyone is interested:
Further to the mail - The charges for airport transfers by shuttle van would be @ USD 6+24.3% Taxes per person per way and by private car would be @ USD 15+24.3% Taxes per car per way.
We do have the mountain flight to Everest everyday @ 6:30 & 7:30 am and the flight fare for the same is US$ 166 per person. The airport tax would be Nrs 170 which needs to be paid at the airport. The trip is on plane which will be with other 16 fellow traveller. The duration of the trip will be for one hour and no landing in between.