WE don't do Wally World or such either. Prefer State Parks, COE Municipal parks or even casinos. Many Elk lodges have RV overnight sites for a donation, I know ours works is donations, but a $10 min. You don't have to be a member, at least at our lodge. VFW and other fraternal organizations also offer overnight, some with electricity. You have to call the particular place you're interested in.
Besides several Elk Lodges offer meals on Friday night and most are very good home style cooking/BBQ at very reasonable prices.