Those PS boxes are almost impossible to find anymore. At least in WIIn the small, Eastern Montana town where my mom's family is from there's a guy who has an assortment of probably 15-20 old Internationals, mostly Scouts and pickups. I always enjoyed driving past and seeing what all he had sitting around his yard.
Quick google maps search tells me this is in Norfolk, NE. I hope those Travelers go up for sale soon or there won't be anything left.