i'm not from this company(so dont see this as advertising), but have been very pleased with the price and quality of their imported Steca CFL's
i like so many others spent months trying to find the best price possible on 12V CFL's, i even imported samples from Rainbow Power in Austrailia, but they worked out far to expensive with shipping and import duty.
Dulas Ltd, from their website http://www.renewable-resources.com/index.htm look like some type of non profit green company with just large corporate type projects, but they do stock a massive Steca range of products in the UK, and can supply any steca product at trade prices (you might have to orderm from your work for best trade prices)
5W, 7W and 11W 12V CFL's, with 10,000 switching cycles are about £6-7 ish each, at the time about 5 months ago, it was the best price available in the UK i could find with small order quantities like 5+, so just thought i would share my findings.
ive got the whole house kitted out with these steca 12V lamps, all automated of an Ocelot controller with ocupancy sensors, as a result, the controller is allways turning off and on lamps, hallways for example 35+ on off cycles per day. bulbs are still going strong with impresive startup times
enjoy
Satman