Geno,
A good set of what? If you mean a good set of cedar arrows, then you can build them much cheaper than commercial wooden arrows. There may be places you could buy cheaper carbon or aluminum arrows, but not necessarily good ones.
If you don't count your time as part of the cost, because you are having fun, then the cost of fletched shafts is pretty low. Field points, judo tips, broadheads all add cost, but that is the case with any arrow. A fletched cedar shaft with a nock will probably cost under $3. Depending on where and how many and what color feathers you buy, you could push $3.50.
I shoot better with cedar arrows for some reason, so the cost is worth every penny, not to mention the addictive nature of arrow building.