...for a broom that can only be used by Witches with the Flight Hex.
Version A
Witches Broom;
Each 1 minute of the Flight Hex fly ability used allows the witch to use the broom to be able to fly through the air as if affected by an overland flight spell (+4 on Fly skill checks) for the next hour. They may stop and start flying as often as they want for the next hour. While they are flying on the broom they may not use the feather fall at will ability of the Flight Hex. The broom can carry 200 pounds and fly at a speed of 40 feet, or up to 400 pounds at a speed at 30 feet.
Version B
Witches Broom;
A witch(5th+ level) with the Flight Hex can use the broom to be able to fly through the air as if affected by an overland flight spell (+4 on Fly skill checks). While they are flying on the broom they may not use the feather fall at will ability of the Flight Hex. The broom can carry 200 pounds and fly at a speed of 40 feet, or up to 400 pounds at a speed at 30 feet.
The idea is the witch uses "feather fall" to make herself lighter and then can fly around on the broom. That's why she can't use that ability while flying.
Some relevant magic items and the Flight Hex text.
Broom of Flying
Carpet of Flying
Flight Hex: The witch grows lighter as she gains power, eventually gaining the ability to fly. At 1st level, the witch can use feather fall at will and gains a +4 racial bonus on Swim checks. At 3rd level, she can cast levitate once per day. At 5th level, she can fly, as per the spell, for a number of minutes per day equal to her level. These minutes do not need to be consecutive, but they must be spent in 1-minute increments. This hex only affects the witch.
Edit; I suppose anyone with the Flight Hex could use it (Sylvan Tricksters, etc...).
How much of a discount would you give a magic item that can only be used by a particular class or class feature? Specifically, a Broom or Carpet of Flying that can only be used by someone with the flight hex.
The relevant magic items and the Flight Hex text.
Broom of Flying
Carpet of Flying
Flight Hex: The witch grows lighter as she gains power, eventually gaining the ability to fly. At 1st level, the witch can use feather fall at will and gains a +4 racial bonus on Swim checks. At 3rd level, she can cast levitate once per day. At 5th level, she can fly, as per the spell, for a number of minutes per day equal to her level. These minutes do not need to be consecutive, but they must be spent in 1-minute increments. This hex only affects the witch.
It upgrades the flight hex from fly to overland flight, even if it uses the feather fall function in fluff. A normal broom of flying just gives overland flight more or less. I'd reduce the cost by the amount of an equivalent broom made with fly. Taking spell level * caster level, such a broom would be 3*5/5*9 = 1/3 of the cost of a standard broom. This would make your witches broom 2/3 of the cost of a standard broom of flying, probably rounded down a bit IMO because the fluff matches well - maybe 11 000 gp.
11,000 gp sounds about right for a leveled, witch only, item.
Thanks for your input.