It seems every form of shooting is getting more expensive, over the years I have seen Wooden Arrow shafts rise in price, as have all the component parts to make Arrows.
12 Shafts==£25-30
12 Fletchings, you need three per arrow so 12 Arrows ==36 feathers @ £5.50 per 12 (16.50 for full set)
Arrow points £1.15-1.40 per point.
Nocks (horn) £5.50 per 6, £11 per dozen Arrows.
That's without the cost of Varnish etc and the time to make them. The only positive side is that you tend to get your Arrows back, if you hit the target that is
If you want a set of custom shafts, matched in weight and spine made by a decent Fletcher, then you will be looking anywhere between £90-120 for a dozen, not cheap at all.