A Virtual Retail Row

TWICE a year, I travel to the world's fashion capitals to cover the runway shows and, to be honest, indulge in lots of retail therapy -- Fifth Avenue, Bond Street, Via Montenapoleone and the Rue du Faubourg Saint-Honoré, been there, bought that. But I have nabbed some of my best finds without even leaving my desk, by letting my fingers do the shopping.

My morning routine includes coffee, the newspaper and checking the J. Crew website for new online exclusives. Before I go to bed, I browse Zappos to see exactly how many pairs of those Marc Jacobs flats are still in stock in my size. (They keep track of those things.) And apparently I'm not alone. Last year, for the first time in history, online shoppers spent more money on clothes and accessories than anything else. A report from technology and market study group Forrester Research found that fashion spending reached $18 billion in 2006 and could hit $22 billion this year, in which 10% of all clothing sales are expected to occur online.

But it's not all about convenience and fast access. Shopping well online has a lot in common with shopping well in those great shopping districts -- knowing the best sources will lead you to something truly unique, a fantastic value, a young discovery. So, from my computer screen to yours, here are the sites I find myself returning to most often for the best merch, deals and service.

For designer clothing, bags and shoes

Bluefly: At 6:30 a.m. EST every morning (that's 3:30 a.m. PST, so beware SWI, or shopping while intoxicated), 150 new styles are posted on this rocking site where I bought studded Miu Miu flats and a Tory Burch geometric print skirt at 40% off the retail prices. There are always a lot of Christian Louboutins too, and even the occasional piece of Chanel or Hermès. The online personal shoppers, or "FlyReps," are on hand day and night, and extremely helpful. And if you have buyer's remorse, there's a 90-day guarantee. bluefly.com

For contemporary clothes and Juicy Couture in every size and color

Shopbop.com: This site stocks a wider selection and size range of contemporary designers than any I've ever seen. Labels include L.A.'s Cynthia Vincent, Vince and Diane von Furstenberg, as well as page after page of Juicy Couture in all sizes. www.shopbop.com

For contemporary accessories

Revolve