I usually watch Hobby Shop K's site for a closer 
estimate of what the *working* yen rate is. 
Another place you can watch is Taro. Take any cel 
there for sale and divide the given yen price by 
the given US dollar price - that will give you 
another example of the current working yen rate.

Most of the time - where there is no quoted price 
in US dollars - I expect to be quoted a yen rate 
of about "four below" the rate that the converters
give. Meaning, if the converter gives me 120 to 
the dollar - I expect no more than 116 to the 
dollar.  But that is just a rule of thumb.

Many Sharp Smiles,
--Drac