(Image credit: Getty Images; Launchmetrics; Sephora) With Memorial Day coming up on May 25, you might be thinking that all the good beauty sales are on hold in anticipation, but you would be very, very wrong. In fact, you can find discounts on products from Shark hair tools and yummy gourmand fragrances from Snif right this very second. All you have to do is know where to look. In anticipation for this week's pre-Memorial Day sales shopping, I scoured all my favorite retailers to find the best beauty products on sale this week, and now I'm ready to pass along my knowledge to you. Apologies to your credit card in advance, because it's going to be putting in a lot of work this week. Take comfort in knowing that your hard-earned money will be going to vetted beauty products that are sure to get you ready for the summer ahead.…