1996 Rodeo 4wd Vacuum Switches

Does anyone know where I can buy the front axle Vacuum switching valves INDIVIDUALLY (not as a set from the dealer @ $177.00+tax). I tested the switches and found the blue switch is stuck (corroded) on disengage, therefore, no 4wd. I soaked the switch in Seafoam and couldn't get it to budge. After realizing I couldn't fix it, I decided to crack that f*#@er open and see what happened. Apparently the previous owner did not engage the 4wd AT ALL and the switch simply corroded into position. Anyway, any help would be appreciated.
:evillol:
Thanx

you might want to call St. Charles Isuzu. Not that they can sell it indivually but it will be a bit cheaper.

Thanks for the St. Charles hookup. They gave me a sweet discount and will have the part to me by the end of the week.