1st of all i searched and didnt find this.
A good way to make gold in wow is to read up on patch notes and look at which items will be changed. A lot of the time prices for items can go up after patches and heres some items that will be affected by 3.0.8 and can earn you some gold
Ink of the sea - A conversion's being added allowing you to trade 10 for 1 snowfall ink.
right now thers a lot of Ink of the sea on the market due to people trying to make snowfall ink for darkmoon cards. If you can get some cheap Ink of the sea (40g or less) i reccomend snatching it up.
Eternal Life - The limiting factor on Darkmoon Cards is Snowfall Ink currently. With the conversion being added there will be more available making the limiting factor Eternal Life. If you can get Lifes for 30g or less I recommend buying them.
Dream Shard - The materials used for some higher end enchants are being changed to use more shards. Blizzard said that they don’t like how cheap shards are now and want them to be in higher demand. If you can get shards for under 10g I recommend stocking up.