I agree w/ Jeff above, if there are 190 2" non-LS 631s and (generally estimated) 1500 4"-ers out there one would expect (over time) to see roughly 8 times as many 4"-ers offered. I've followed this mkt fairly closely for 4/5 years now and the ratio is nowhere close to this. This has always seemed odd to me.
Having said that, something pushing $2K is what I would expect a 2" LNIB to sell for currently.