What are the bricks in this picture/video?
These are all fairly common parts that shouldn't be hard to find. It looks like they are a cheese slope (50746), a 1x1 tile (3070), and a 1x1 round plate (4073).



These parts are common enough that they are available in many sets, or you can purchase them separately from LEGO Pick-a-brick. If you're looking for a more affordable secondary market, you could also check out Bricklink.