I don't know. I called Monday and today and got their answering service. Didn't leave a message.
I did contact the link you sent, and they said they make the lamp I need, but it's not popular and hadn't made any in a year, and that I'd be better off buying direct from Amergraph if I just need one bulb.
I've got a bulb, but inadvertently buggered up the lamp socket when I put in an older bulb. I ordered a new socket from Bulbtronics, but I don't want to be without a backup, now that I effed-up the one I had.
I've seen other sources for replacements, some about 1/8 the price Amergraph charges, but I'm a little gun-shy about getting something that might screw things up. I manage that well enough on my own, fixing things until they're busted.
Any other sources that folks have had good luck with would be appreciated. I'll call them tomorrow and leave a message if I don't get an actual mouth-breather on the other end.