The lights are cheap....its the ballast that costs. Take a look at
Current USA Nova HO X2 Freshwater Aquarium T5 Aquarium Lighting T5 Aquarium Light T 5 Aquarium Light T 5 Aquarium Lighting and click on the T5 fresh water setup. You can get 2x54w 36" for ~$70 if I remember correctly.
The problem is that you have 2 crossbars on top of the tank not one in the middle, so you may need 24" lights instead.