[sdiy] OT- Battery powered HV supply?

[Toby Paddock]

Sorry for yet another off-topic question, but this is where the good answers 
are.

I finished a little blinky neon bulb project and I found the current draw is 
lower than I expected. 20uA at 300V. So now I'm wondering about a low current 
battery powered supply. 

Any favorite extremely low current supplies? I don't care about requlation or 
ripple. Would be nice if I could hang this up without wires and have it run 
for a year. I guess I could use 34 9V batteries.

Thanks,
Toby