When I'm not in thrift shops looking for olde cameras, I'm checking out dollar stores. I am having trouble finding just the right size plastic tub for 8x10 prints but I keep looking. I did find a Rodagon 50mm f2.8 enlarging lens -- brand new -- in a bargain bin in the only real camera store still left within 100 miles. Bargains are where you find them.
Kitty litter boxes should hold 8x10s. There's always a million of them at my dollar store, stacked to the ceiling