As I've recently learned, finding 150-watt R40 floodlight bulbs can be a bit tricky. Of course, bulbman.com has 'em, for about $11 each (20K-hour rated, which is swell), but just in case anybody wants to pick up a six-pack of GE bulbs (2K-hour rated, which is a drag) for $37.50(USD), delivered, here: http://www.ebay.com/itm/6-GE-150-Watt-R40-BR40-Spot-Light-Bulb-Trac...
Just in case you find yourself (ahem) a bit short on disposable income these days, and need something to get you by for a while. ;-/
Excellent deal, I picked up a pack a few months ago. He also had Grande/Giant R20 100 watt floods but it looks like he sold out, crazy cheap price like $37 for 25 bulbs.
I think I will get 6 more of the Imperial bulbs just to have even more extras :) It seems like these will be gone for good or really expensive in the future.