How to make gold in instances

Some vanilla enchanting materials have had their prices increased dramatically in the past few months on some realms, notably Large Brilliant Shards as they are no longer obtained from the short instances, like Scholomance and Stratholme due to their level drop after Cataclysm.For example, Large Brilliant Shards sell for 60g these days on the realms I play on, Small Radiant Shards 35g and Large