Spending beyond your means in a dream is read as giving away more energy, attention or feeling than you can spare. Some dream books link it to filling an inner emptiness with outer things.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.