Four Wheel Pop-Up Camper - $3500 (Durango)
https://westslope.craigslist.org/for/6076226603.html
Pop up truck bed camper - $300 (Broomfield). Old Grandby FWC maybe worth fixing up
https://boulder.craigslist.org/pts/6060214361.html
Coyote Slide-In Truck Camper 04'-05' - $2500 (Datil, NM)
Kind of...