As a food vendor, place the dry ice in the top to freeze what is below. Place the dry ice in the bottom to cool what is above it. As said before, wrap it as to not damage the plastic in the fridge or freezer. But I would head for a small$100 fridge, it WILL be cheaper.
American Tradition 42R-Cadillac SRX Blue Ox Koni 5050XL MCD Scangauge D Samsung rf197
Fulltime since 2012