Shop for a cause during the month-long sample sale extravaganza 7th on Sale Online. The online auction, hosted by eBay and spearheaded by Vogue magazine and the Council of Fashion Designers of America, brings members of the fashion elite from all over the world together. One-of-a-kind pieces from the industry’s hottest names including Marc Jacobs, Dolce & Gabbana, Michael Kors, and many more will be auctioned off. All proceeds will go toward HIV and AIDS research.The sale will include items for men, women, and children, as well as jewelry, shoes, handbags, and much more. Through December 7, www.ebay.com/7thonsale.

More than 50 designers will sell items at up to 80% off during the Billion Dollar Babes sample sale blowout. Labels like Chip and Pepper, Sass & Bride, and Oliver Peoples will be on sale, as will items from red-carpet dresses to home decor. The sale includes a complimentary bar and makeovers by Giorgio Armani Cosmetics. The event is free, but an RSVP is required by 4 p.m. on Friday, November 18 (RSVP at www.billiondollarbabes.com). Friday, 5 p.m.-10 p.m. (members/VIPs), Saturday, 8 a.m.-6 p.m. (general admission), the Altman Building, 135 W. 18th St., between Sixth and Seventh avenues.

European looks, vintage flair, and just a little bit of attitude – that’s what you’ll find at the Tracy Reese sample sale, being held this week. Her fluid skirts, tops, and dresses are just right for city women. Wednesday-Friday, 10 a.m.-6 p.m., 275 W. 39th St., between Seventh and Eighth avenues, 11th floor.