I order full spectrum shop light tubes from Long Life Lighting. They have a huge, huge store with every bulb known on the planet. They even sell reproduction bulbs needed for the light fixtures from the early 1900s.
Their price is reasonable on the full spectrum bulbs, and they ship extremely well. They've been in business over 30 years too!
I organized four different quilt shop road trips a few years ago and we included this in one of the stops.
http://www.lightbulbspecialist.net/fullspectrum.htm