With electric last summer i was paying about $410.
As of August 2018 I paid $385 but I think that was the cheapest and smallest size they have. My rig barely fit and it is 28ft total. Good luck with the wait list though. Electricity is billed at $0.10/kwh. My bill was about $70 with a 13.5k ac unit running continuously during the day. Keep in mind your rig has to be in good shape and less than 10 years old.
Check with the campground for current rates. Rates can change from year to year
With electric around 450
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