The more of anything that is produced the lower the unit cost. The cost of the material the blank is made from is a small part of the finished cost. IE. the cost of the bamboo in the finest rod is a small part of the rod. If only a handful of a certain glass rod are produced then the price will be high, the same as graphite or any other material. If you want great deals on glass rods hit the garage sales, flee markets, pawn shops and online auctions. The hunt is half the fun.

Eric