I wound up converting 3 lamps for a total cost of about $12 in lamp parts
6 ceramic light sockets
2 3-way switches
1 25' roll of 14awg single conductor stranded copper wire
The lamps have been working great for about 3 months now. They're saving me money on electricity and light bulbs.
Step 1: Evaluate Your Lamps and Decide What You Need
I found a three way chain switch at the hardware store which looked like it would fit in the tube in place of the dimmer switch.
The pre-fluorescent lamp already had a 3-way rotary switch so there was no need to replace it.
Step 2: Demolition
You will want to leave the cords that are strung through the lamp where they are as we will reuse these.
Step 3: Wire It Up
All of the components I was using had pigtails so I used wire nuts to secure the connections. (sorry no pics I finished the project a long time ago and just found this site recently)
You may need to use some additional wire as there were only 2 wires going from the dimmer switch to the top of the lamp and now there will be 3 (hot A, hot B, and neutral). Make sure to use a heavy enough gauge of wire to carry the voltage.
Step 4: Mount the Sockets
The lamp that was already a fluorescent didn't have any pre-threaded holes but there was a big plastic hub in the center so I drilled a pilot hole for each lamp and screwed them in place with sheet metal screws.