Here is a list of the camping I know about in the area:
-13 miles N of Canon Banks/Sand gulch /BLM /$4 to $7 per night (shelf road climbing area)
-14 miles South of Canon Oak creek camp ground Free /FS /but will still have snow.
-There is also some camping on the way to the Royal Gorge Bridge and Park on the left down a dirt road a mile or two before you get to the park, I think its is still free but havent been there in a while.
-Temple canyon as suggested above.
-There are pay sites on the river at five points,valley bridge, rincon, and a few more up stream. Free camping north side of the river at Texas creek.
-There are also all of the RV park places along US 50.