Lotsa nickels for some of those: http://www.ebay.com/itm/STIHL-090-A...883580926?pt=US_Chainsaws&hash=item43ba0333fe
That same ad has been on ebay for about a year now,maybe longer before I first seen it.It may be New Old Stock,but he's asking way too much otherwise it'd be gone by now.
Most 090's I see in good strong condition with decent appearance tend to go for $1000-1500.Occasionally one will be $800 or so,but that's rare.