Someone walked into Housing Works - the New York-based thrift store whose profits house AIDS patients across the city - with a bag full of clothes. And by "bag" we mean almost 500 pieces of vintage Yves Saint Laurent. So while Christie's is going to try and sell Monsieur Laurent's art to the very rich and unaffected, Housing Works is going to sell some vintage YSL to you. They're hosting a cocktail party next Thursday December 11th at their 23rd Street store. It's free and open to the public and while you sip your drink you can do some damage. But not too much damage because the prices are like Marc by Marc - on sale. Evening dresses for $250, suits for $150, a leather skirt for $90. We won't guarantee le smoking or safari, but we'll bet it's worth stopping by.