Hmmm... actually this set is not hard to find (but it is rare). It's hard to find in the condition that I want it in, but its not hard to find in the sense that I come across it fairly often.
The set I bought must be the 4th to 5th set that I've come across. Mostly, the box is in bad condition or the individual robots, which are 90% white, have been badly yellowed. So nice box and white robots are hard to achieve for this set.
I passed on the previous set I came across, which was C10 and as good as MISB case fresh because the asking price was just too high - shop-owner was asking USD$1450 for that set.
My current set has a C8.5 close to C9 box I'd say. There are one or 2 creases on the back of the box. The toys although unplayed appears to be C9 to C9.5, for some reason, I just think they are not as new as the previous set I saw (not sure if it's my mind playing tricks).
This current set was more within my expectations in terms of price.
