That is what I am looking for, i got the voltage 12v and .7A but i don't want to buy one and not have the plug fit. That is why i asked if anyone had purchase one and from where.Er... no. Any power adapter that gives you the proper DC voltage and has the appropriate plug will work just fine.
I did in fact try that and it yielded a plethora of crap, i only posted here because i thought that someone had been in my situation and may have a suggestion.Anyway, google search for "Airport Basestation Power Adapter" reveals that Amazon has them for $25. Quite a deal if you got the APX for <$100.