Yes, IgE and IgG food allergy testing is pricey, but NOT necessary. You can find out what you are allergic to by way of challenge and elimination, but it takes some time. In my book Candida Crusher, I've outlined my Hypo-Allergenic Diet approach, it is a page which explains the most likely allergenic foods (in the right column) and the least likely allergenic foods (left column).
The most allergenic foods are of course the dairy foods, but eggs, wheat/gluten, peanut, oranges, bananas and a few others come up relatively frequently. Look at the foods you LOVE the most, they are the first ones I usually take from a person's diet. Best lab in my opinion is US BioteK in Seattle, but they are big dollars.