Search for coupon codes.
Add your selection(s) to your online shopping bag. Then, open a new internet browser and Google the retailer plus coupon code. So for Gap, you would Google "Gap promotional code". Some of the more popular databases will pull up, I will generally look through retailmenot.com to find a code that work. I just continue trying the codes until one works. At time, I have been able to save 30% off an item and it only takes a few minutes.
To gain additional money back, link to the retailer through Upromise or your credit card reward system.
Continuing to cut your budget.