Hmm. I cannot remember the price of my two tier two foot tanks. Probably less than S$50. No tanks covers, that is why it is rather inexpensive. There are plenty of Luo Han fish shops around, maybe can get a cheap one from them. Lights are from a single unit housing two compact florescent tube set up for planted tanks (tubes 6500K, 36 watts each). I think the price was S$98 for the lights. I have a timer, very old, cannot remember the price, probably less than S$30. Most important is an ultrasonic humidifier from FEF (Thomson) for about S$48.
Lights switched on for 16 hours a day. I got my aluminium foil for free to wrap around the entire tanks to make sure that as much of the lights get bounced back into the tank. Lights has helped to make some of my plants redder.
Due to the long period of time that the lights are on, evaporation is very high. I keep about an inch and a half of RO water at the bottom of the tank to maintain humidity at a decent level. The ultrasonic humidifier also helps to keep temperatures down.
You can figure out how much the whole setup cost. I can't count and that is why I study biology!