#1
I've just ordered a Boss OD-3 but it doesn't come with a power supply.
I've checked the specs and it seems that my Roland Micro Cube power supply would work (same Voltage, mA and everything)
I'm guessing it would be fine to use but thought i should ask first

Cheers.
#2
as long as its 9 volt 2.1mm centre negative you'll be fine mA is irrelevant really.