Stay far away from the Ebay arrows. What guys are doing is buying 5-6 dozen at a time, checking their weight, spine and consistency, pulling out the best to make up a good, matched set for themselves and selling their culls. Technically, the arrows are still brand new, but they've been picked over. What you're actually buying is the crappy shafts that are someone else's rejects.

I'd second Double Creek's recommendation.