its a load of crap. the s939 opterons are basically higher quality athlon series processors. the main features that make the s940 (true server processors) different to the mainstream athlon series are absent from the s939 opterons. they work just as well as the athlons except are made from the same silicon wafers as the high end FX series and have a higher tolerance for heat and voltage.
edit: no newegg does not ship overseas, unfortunately they don't seem to have realised that when making their suggestions. you are going to have to have a look around for those parts and expect to pay more than the prices listed in this thread. my guess is that they have been converted to NZD from newegg prices which would be cheaper than current retail prices in new zealand