I'll leave out the various cleaning and scrubbing supplies and disinfectants.

PVC pipe (hides and egg-laying places for geckos)

PureNess pet dishes from Van Ness. (I love these things SO much--smooth underside, 'finger holds' smoothed, and perfect sizes to double as water dishes and hides. The smallest size fits into hatchling bins perfectly, can't be tipped. Easy to clean and disinfect).

Plant chemical sprayer--pressurized with a hand pump, these are great for misting everything quickly.

Soldering iron.