384 well plates (16x24) are one of the “standard” sizes and the densest that a typical lab is likely to have on-hand. The next size up/down (fewer, bigger wells

384 well plates (16x24) are one of the “standard” sizes and the densest that a typical lab is likely to have on-hand. The next size up/down (fewer, bigger wells) is probably 96 wells in an 8x12 grid.