This past weekend we stayed at Blue Mesa Escape near Gunnison, Colorado. This campground is on Passport America. $17.50 for full hook-ups + amazing water and mountain views = a good deal! They also have some nice cozy cabins! This campground is a hidden gem in the area and the owners are super wonderful! During our time is this area we enjoyed exploring the Curecanti National Recreational Area and Lake Fork. Lake Fork also has some nice basic RV sites for $16 a night! There is also plenty of BLM land and other places to stay, check out Campendium!
Note: There is really hardly any WiFi and not much cell reception in this area. This is the reason we decided to visit on a weekend, rather than during work days. It is a great place to wander where the connection (WiFi) is weak! We love spending weekends in places were we cannot be connected to anything except nature and each other.