Look for local bargains on LED bulbs for household lighting such as this one:
The $0.99 bulb on the left is rated at 1600 lumens and 14 watts for a luminous efficiency of 114 lumens/watt which exceeds that of any fluorescent bulb. And, even at equal lumens, these type of LED bulbs are better than CFL for plants because more light energy is produced between 620 and 700 nm for which the human eye is insensitive but plants strongly utilize. Fluorescent bulbs typically have a sharp spike at 611 nm (orange-red) and almost no output at longer wavelengths.