Oriley's has an AC DELCO neutral safety switch for $58.99
They also have a BWD for $89.99.
I say go with the AC DELCO.
Replacing it should be pretty easy. If you look on the drivers side towards the firewall you can see the switch sitting on top of the tranny. Should look like this..
it's that black box looking thing on the transmission on the bottom left hand side of the pic..