Yes quite a few.
High end is Palm Creek where your rig will be inspected if over 10 years old,
Middle of the road is Fiesta Grande. a nice resort with lots to do.
Both Palm Creek and Fiesta Grande are in town and walking distance of Shopping and restaurants.
Further out and less expensive is Casita Verde a small, resort RV park.
There are place to just park an RV with no resort features from about $275.00 a month.
Palm Creek will give you one week free the last I knew and you could use that week to scout out a more permanent, less expensive place.
No place in Casa Grande is close to 100% full in the winter
My place to stay is Fiesta Grande. Lots of activities including a dance every Friday night with a live band. Big Canadian contingent a Fiesta Grande.
PM me for more info on Fiesta Grande.