There was talk of this at the print showing.
Well, I was in my local hardware yesterday evening and noticed that they have 100W and 200W bulbs back in stock!!
They are to be widely available (eg woodies etc) and are classed as "Rough service bulbs". The ones I saw were from GE and Phillips and were frosted - and the ones I saw were only in bayonet cap, although I'm sure screw in will be available too.
Best of all was the price - ~2.
I know someone will have to test them out for even illumination etc, but its good news!
From a UK site: