To dream that you are at a Flea market proposes that you are feeling underestimated or overlooked. You are undercutting yourself. Consider the imagery of the thing you are purchasing and how you feel about it in the fantasy."

To dream that you are at a flea market suggests that you are feeling undervalued or under-appreciated. You are selling yourself short. Consider the symbolism of the item you are buying and how you feel about it in the dream.