Actually, you could get everything you need at the home depot! I love the home depot.
Thermometer hygrometer combo: Accurite weather station -$11
Light dimmer for the UTH: Lutron Lamp Dimmer - $12
Plexiglass/Acrylic - price based on how big/ thick it is. Don't forget to grab an acrylic cutter though, that is the only way to effectively cut it.