1440 Third Ave between 81st and 82nd Sts. Subway: 6 to 77th St. This local textile designer is taking over the Society of Memorial-Sloan Kettering Cancer Center Thrift Shop for a three-day charity sale. Score pillows, carpets and fabric for up to 70 percent off, with all proceeds benefiting the center's patient care, education and research programs. Handwoven cotton rugs are lowered from $450 to $270, silk ikat-print pillows are $269 (were $525) and block-print fabrics are $60 per yard (usually $125).