Last year, we stayed at the Clark County Shooting facility. It's on a small hillside which affords nice views of the city. It's $20 per night (last year's prices), and includes full hookups including 50amp service. When were there last year, there were only four RVs in the 80 available spaces. You are actually quite a way from the rifle and pistol ranges, and noise was not an issue. Here's a link to the site where you can read about it and make reservations.
Clark County Facility