At sandridge outdoor group board is $380 with GST I believe. Indoor I'm not sure. Outdoor private or semi-private I think is $480 with GST though I'm not completely sure.
Yes, I do ride at Sandridge and its a great place. I'd recommend it. Tricia leaves on the 3rd for Florida but she has a great dressage coach coming in and an alright jumper one coming to fill in for her. If she's not to far from Camrose I'd recommend boarding at Sandridge.