This answer to this question is very simple. A big yes!!
Why? Let me point our multiple reasons but then before going there, let me ask you one question. Are you sure you want to give PMP exam in next month or 2? If the answer to this question is yes, then the economics of being PMI member will make lot of sense to you.
As illustrated above, you not only save cost by becoming member of PMI and then writing your exam, but also end up getting loads of additional benefits.