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.