Would any of your customers stand still for a new tub, bidet, and toilet for $26,000? If so, the folks at Eljer Plumbingware would appreciate hearing from you. For those who have the cash, Eljer's Carte Blanche Collection may be worth the astronomical price. It is solid cast bronze, made and finished by hand. And it set the tone for 1989's new kitchen and bath products: upscale in the extreme, with both domestic and foreign products contributing to variety that approaches the infinite. The set was one of thousands of new products put on view by more than 600 exhibitors at this year's Kitchen/Bath Industry Show (K/BIS) in Dallas. Some of these were introduced earlier in the year at