The D/UV-F bulbs are custom made exclusively for the Vitamin D Lamp, model D/UV-F (which uses 4 of them). This video describes how to replace them (and shows which screws to remove to do so).
The Fiji model FR20T12/BL/HO Tanning bulbs are for use only with the Fiji Sun lamp (which also uses 4 bulbs). Fiji Sun bulbs last a very long time: approximately 1000 hours of use. Tanning sessions should average approximately ten minutes of exposure time.
Bulbs ship from Canada, no additional import fees.