Part #3069
Part #3069 is often known as Flat tile 1x2. We know this part is available in LEGO Digital Designer, LDraw, Brickset, Bricklink and Rebrickable. You can buy it on Amazon or Bricklink.
44110 (LEGO)
63286 (LEGO)
30070 (LEGO)
88630 (LEGO)
3069b (LDraw)