Amazon.com: Texas Instruments CD4011BE ICS and Semiconductors, Quad 2-Input NAND Gate, 14 Pin, CMOS, 4 Element, Plastic Dip Tube, 19.3 mm L x 6.35 mm W x 4.57 mm H (Pack of 10) : Industrial & Scientific
Amazon.com: Texas Instruments CD4093BE CMOS 2-Input NAND Gate, 14-Pin, Plastic Dip Tube, 6.35 mm W x 4.57 mm H x 19.3 mm L (Pack of 10) : Industrial & Scientific