I know this is an old thread, but I figure it is worth updating as a NIB inch just sold on gb for $2,700. Another 4 inch advertised as new sold for $1,800 on gb, but it appeared to have been altered after leaving the factory. I assume a 3 inch NIB would be a little higher in value as they are much harder to find for sale. I have also seen very few 3 inches for sale NIB(maybe because the 3 inch is a great carry gun and people are actually using them). There are approximately 1/2 as many 4 inch models (3,784) but there are more in 98% plus condition.

In summary, prices appear to be going up on the 547's as collectors are realizing how scarce a nib 547 is.