Kathyy and caoder are right, you don't have to pay for expensive tubes at an aquarium store. There are fluorescent tubes available for less that will do well.
When browsing your local store for fluorescent lights tubes, look for types with names that include words like "sunlight", "full spectrum", "natural". Then check the specification on the package for colour temperature in the range of 5,000K to 6,500K. These are in the range that provide the most light energy absorbed by the plants. 6,500K is preferred, and 5,000K will do, as well.
I use Philips brand, brought at a home improvement store (Home Depot, here is USA), with a colour temperature about 5,000K and grow plants pretty well.
Eheim Pimp #459 - 2213, 2234
SunSun Pimp #47 - (Perfect) HW302