I put 3 of those CFL's in my lampost in 2011 and one is still going strong. The other 2 CFL's finally burned out and were replaced by LED's and those 2 LED's have since needed replacing. The CFL's were great and one puts out as much light as 3 of the LED's.
I just found they are still available online at lightbulbs.com, a 60 watt that uses only 13 watts and is only $3.29 apiece.
TCP 12778 - Twist (Candelabra Screw Base) Compact Fluorescent Light Bulb