JDice is absolutely correct.
I can get beautiful arrows out of $.50 bamboo garden stakes. But what I gain in price I lose in the time it takes me to turn those tomatoe stakes into arrow shafts. I'd estimate I put a couple hours into each shaft, and that's just making it a shaft, not yet an arrow.
I can sit on the floor at Home Depot and go through all their 378 5/16" dowels and get some good candidates for arrow shafts, but it's going to take me a long time to sort through them and I'll still have to spine, weigh, and straighten them at home.
I can buy lots of 500 shafts from a major supplier of shafts and save some money. But when I get those home I need to spine, weigh, and straighten them before they're fit to turn into arrows.
Or, I can purchase a couple dozen shafts from a retailer and pay them to do all that sorting. I just have to pay in money rather than the time I put into the other methods.
Guy