WOW Gold in my case

You should be checking for food on the AH as often as possible (twice a day,WOW Power Leveling EU, in my case), and don't forget that if you use Auctioneer, you can set up your snatch list to automatically notify you if your scan contains good deals with wow items.

That all depends on what you cook. I got into this because I once paid 100g for five Spiced Mammoth Treats for my hunter's raid night.

You may be undercut in the short run, but unless you're up against someone else with the same tenacity as you, you'll come out ahead at the end.