I'm parked for a couple of months at a campground in southern Arizona that offered a flat rate of $700 for both months ($700 total), no extra for electricity, tax included. Nice campground. When I come back next winter for 6 months the rate will be $390 a month plus electricity.
When I pull my 30' 5th wheel all day, it's $100 a day for diesel. Prices have dropped some since I was traveling somewhat continually, so I have hopes the pocketbook will squeal a little less when I'm back on the road.
Consider volunteering for national and state parks. Give them some labor, probably 32 hours a week, and get a free spot to plug in. I've touted volunteering here before because I love it but also because it's a great way to meet really nice folks and to live economically.