I'm pretty sure it's not the cheapest option though I have not called them up myself. Just been daydreaming about them. You can get a feel for their prices by looking
here. I first noticed them in the Griot's catalog and did a little searching to find out who made them since things are marked up by no small sum in the Griot's catalog. The florescent lights I have in my shop were in the Griot's catalog. I found the manufacture and got them for more than half off what the Griot's catalog wanted for them.