Anacortes carries a straight through correct image finderscope, but it is made for big binos. Still, perhaps it could also be adapted for use on your scope.
The only one I know of is Vixen I believe. As I recall, the 10X50 can be configured either way.
They've got a 10X50 and a 7X50 Don't know if Anacortes has it. http://www.vixenamerica.com/products/Default.asp?TopCatCode=AV&Fam_or_Cat=AV-FS&Short_Verbose=Finder+Scope