How to make easy gold with blacksmithing

Enchanting rods are easy, profitable and fast to make, yet there always seem to be some rods missing from AH, often leaving the prices for you to decide. If you have blacksmithing and your Auction House doesn't have certain rods, why not make some fast gold? There's exceptions too though. For example, AH almost always has 10+ Golden Rods for sale with low prices, so better to sell some other rods