Forget about $6,000 shower curtains. If you're really looking to splurge, how about an ultra-luxurious mattress? The market for high-end beds is now booming, thanks to the aging baby boomers' penchant for luxury. Stephen Pino, manager of a Duxiana store at Union Square in Manhattan, with a $4,000 to $6,500 mattress on Jan. 9, 2004. The store has two sleeping chambers for customer tryouts.