Yep Wal-Mart, or a home improvement store such as Home Depot or Lowes. I get mine at Lowes, four pack of 27w 6500K for $12.Walmart, 6500K. Wattage goes from 6 watts to 50 watts I have found. The bigger the better. DO NOT go by the "Equivalent" wattage output a 13 watt CFl might give out the equivalent light of a 100 watt incandescent, but it is still only 13 watts. Go big.
I make mine myself, and there are a lot of DIY ideas for CFL's in the DIY section.thx. do yall make the holders with plug yourself? or are there pre-made ones you can buy?