Grow lights run a wide range of prices and configurations from the new high output T5 fluorescent bulbs / fixtures to the High Intensity Discharge bulbs. Or a combo HID / High Pressure Sodium fixture. The HID and HPS bulbs are expensive. Such fixtures generally range from $200 to over $500 in price.
Much less expensive are the new T5 high output fluorescent grow lights. One T5 bulb will put out as much light as two T12 bulbs. The older T12 fluorescent grow bulbs are being phased out in favor of the T5 bulbs. Prices for T5 fixtures range from $25 to 35 for a two or four bulb two foot fixture to $90 plus for an 8 bulb four foot long fixture.
Amazon carries a good selection of grow lights.
http://www.amazon.com/dp/B003U51E8E/ref=asc_df_B003U51E8E1831175?smid=A3VZKFNMHAPZBO&tag=hyprod-20&linkCode=asn&creative=395105&creativeASIN=B003U51E8E
Another good resource is http://homeharvest.com/lightingmain.htm and
http://homeharvest.com/whichgrowlightisrightforme.htm
http://www.plantlightinghydroponics.com/grow-bulbs-fluorescent-c-73.html
This website is a good resource for grow light bulbs at reasonable prices and for hydroponic supplies.
Grow Light Tip: Spend the extra dollars to get a 2 bulb fixture. The one bulb fixture I purchased worked ok when the plants were smaller and I had it close to them. But now my plants are larger, the one bulb fixture does not cover the area where the plants are sitting as adequately.