First - what you own has absolutely nothing to do with what you'll pay for an RV park. We had a 40' motorhome and our first choice was always boondocking or public parks. We disliked having to pay the prices of RV parks because we enjoyed outdoorsy things to do in natural surroundings and didn't enjoy looking at other RVs parked in a row.
I gave a link above for the Voyager RV which Lauren said is way on the east side. It's actually only 8.3 miles from the KOA - 12 minutes according to Google maps. :) It has a lot more activities than the KOA.
Rates:
Voyager - $294/week ($42/night)
Voyager - $828/month ($27/night)
Cactus Country - which would be at the bottom of the list is:
$617-$774/month; $252 - $288/week
Tucson Fairgrounds - $125/week
South of Tucson is a very nice RV Park which would give you a chance to explore a different part of Arizona and yet you could do day touring in Tucson. It's called DeAnza RV in Amado.
DeAnza RV: $260/week; $675/m + electric
Catalina State Park is $30/night
Gilbert Ray Pima County Campground is $20/night
Out of all of these, Gilbert Ray would be our first choice followed by Catalina State Park.
It all depends what you plan to do once parked. You have plenty of options.
