Use the buddy system.
Hogging sample sales to yourself is bad karma. Share the wealth with your friends because they would do the same for you. If you shop in a group, split up. You can hit several corners of the venue and hoard more merchandise altogether. If your boys can't join you, keep them in the loop. Snap photos of the clothes you picked up to get a second opinion that you trust. Some highly exclusive sample sales may stop you from taking photographs so have a quick hand.