If you can arrange it; bear in mind that it's £40 for the first one, and they would probably all have to be different diameters, with everybody having to take responsibility for accurately measuring the internal diameter of their steerer.
As in the price for a 34mm one would be £40 and the price for a 38mm one would also be £40, the price only being driven down if 2 people wanted 34mm ones etc.?
If you can arrange it; bear in mind that it's £40 for the first one, and they would probably all have to be different diameters, with everybody having to take responsibility for accurately measuring the internal diameter of their steerer.