Just did a search for a used one, seems many were available for one reason or another.
I need to know the following if you would like concrette information on price and availability.
The tag on the transfer casew will have the number.
(4 Dr), Sport Trac, part time (switch on dash), ID 2L24-7A195-AA
(4 Dr), Sport Trac, part time (switch on dash), ID 3L24-7A195-AA
(4 Dr), Sport Trac, part time (switch on dash), ID 1L24-7A195-BD
(4 Dr), Sport Trac, part time (switch on dash), ID 1L24-7A195-BE
(4 Dr), Sport Trac, part time (switch on dash), ID 1L24-7A195-BF
(4 Dr), Sport Trac, part time (switch on dash), ID 1L24-7A195-BH
(4 Dr), Sport Trac, part time (switch on dash), ID 1L24-7A195-BJ
(4 Dr), Sport Trac, part time (switch on dash), ID 1L24-7A195-BK
(4 Dr), Sport Trac, full time
(4 Dr), Sport Trac, part time (switch on dash), ID 3L24-7A195-AB
I ran one for the heck of seeing the price, on average, a used one will be $220 for the low and 500 on the top end with very low miles.