Some here cost more than others. Arguably it's around £35 for 100 Feathers. Some sites may knock a bit off the price due to the bulk order, but there's always a delivery cost so it cancels out any real saving. Derby and Astras however are under £10 for 100 but I prefer Feather. I wouldn't spend that money to possibly end up with 100 things I didn't like.
Feathers are about £20 delivered to the UK from a B&B listed vendor dridiot, check out the vendors hall of fame.