Career goals? How will you be financing the $? I assume you have a decent gpa if you got into a T25 school but if you study for a retake and score really high 165+, you could be looking at almost a fully scholarship at your regional.
Also the GMAC (the creator of the GMAT) offers GMAT prep software which includes 2 free practice tests and some additional practice questions. You can also buy two more practice tests and more practice questions through the software
Have you applied to any schools? A 161 should get you into many good schools, maybe even with a small scholarship, as long as your GPA isn't terrible. Possibly even a top 50 school.