Unfortunately it seems to be the trend for pedals to not use batteries anymore and it's assumed everyone has a 1 Spot with a daisy chain ready to go. That being said, unless it needs a very particular power supply, it might be less hassle to just invest in something along the lines of the 1 Spot to avoid worrying about power supplies in the future.
this is a tough one. most of the newer EHX pedals require an external power supply.
HOWEVER.... I don't think that power supply is always included with the pedal as a new item. used? you're on your own.
The listing is the key thing. Did that listing say the power supply was included? Did you specifically ask if a power supply was included?
The prevailing assumption is that pretty much everyone has at least 1, if not more, multi-pedal power supplies lying around.
If the pedal is one you really want/need and you got a good price..... I'd say you're better off dealing with it.