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Nab this Michael Kors gown for $800, or these Manolo Blahniks for $150, at the Posh Sale.

"It's for a good cause."

Indeed, in these recessionary times, that may be the best way to justify buying a Louis Vuitton bag. And the fact that it's up to 80 percent below retail always helps, too. Those two elements will come together this week at the 37th annual Posh Sale—a benefit for the Lighthouse International, a New York-based organization that fights blindness—where more than 20,000 couture, designer, contemporary and vintage goods will be available at some seriously discounted prices. Highlights include a Dennis Basso chinchilla fur coat ($8,500), an Yves Saint Laurent silk gown ($1,200), and a pair of Manolo Blahnik peep-toes ($125).

Kim Cattrall, this year's Celebrity Chair for the event, has dipped into her own closet, donating handbags from Christian Dior, Celine and Kooba, as well as two Cinzia Rocca coats and a Missoni dress. Cattrall wore the latter piece in the final episode of Sex and the City, and Lighthouse International reps say it will be auctioned off at the Sneak Preview on Wednesday night. A Splurge Bar will also make its debut that evening, offering ten pricey items ranging from four tickets to a Yankees-Red Sox game in James L. Nederlander's box ($4,000) to a pair of Ortman & Sheff Art Deco platinum and diamond earrings ($1,000). Tickets are still available for the preview night, where all the best loot will surely be snatched up. So hurry, hurry, and remember: It's for a good cause.

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The Posh Sale, May 14-17
Lighthouse International, 110 East 60th St.
Tickets: $150 and $250 for the Sneak Preview, $10 for a one-day pass, $25 for a three-days pass.

Shoes photo by Dorothea Lombardo