I've been careful to not buy any gear that doesn't take AA's, kids toys don't fall under my gear list so they may have others but even then they tend to be AA, or AAA, or C or D. The only things I have that take coin cells are vehicle remote keyless which the physical key is the backup so I just toss a pack of those coin cells in the glove box.

All out computers are laptops and those have a small internal nicad back for the settings so its not a replace every couple years like a desktop. I've found nothing else I need that takes coin cells.