Five bucks? Just kidding. A running truck is $200 - $1000 in my area. A solid truck goes up from there. Check craigslist etc for local pricing. 4x's are less common than 2x's... This isn't a 67 muscle car you're looking at, so expect to pay accordingly.
Checking on the other website (who's name we must not mention, but ends in ification.com) shows production numbers of zero or maybe 'unknown' 1970 step-side 4x4 f100 pickups. Given that, I would check the pedigree of the truck...

darrell