THE WAVE Hill Shop, West 249th Street and Independence Avenue, has extended its special clearance sale through Sunday, June 28. For a few more days, from 10 a.m. to 4 p.m., guests can still enjoy a discount of up to 90-percent off, on gift items for the home, bath and body products, toys, books, garden tools, clothing and seasonal items. This cash-only sale takes place in the Tea Room in Wave Hill House, but visitors can stop in the Wave Hill Shop, at the Perkins Visitor Center, to get the full schedule of hours for this limited-time event. For more information, call 718-549-3200.