Indeed - know exactly what you are talking about we had one for my sons' mice (before they were food items hehe). Big fan of plastics as well for the easy clean and non-porousness. Wood falls on the other end of the spectrum - might look natural - but just soaks up all kinds of nastiness and could possibly retain some bleach after trying to clean thoroughly.

Have bought small cat litter pans, sandbuckets, plastic planting pots, tupperware, plastic cereal bowls, containers left over from them huggie-style wipes - whatever i happen to pass that's uber-cheap and plastic.