Hi there,
Camping in Oregon state parks is very popular and they are many campsites you can choose from so you will have no problem finding one. One thing I would suggest is to book in advance before you go as they tend to fill up quickly.
Another exciting and popular way to go about tenting would be staying at a 'yurt' which is a round, semi-permanent tent similar to the ones used by the nomads in central
Asia. You can find these 'yurts' in privately owned
camping grounds and prices start at $25 a night depending where you camp.
Hope this helps
Vacationbuddy