Rafting with a kid

Arizonan here born and bred. I’ve hiked the canyon many times over the years but now have the pleasure of introducing it to my 10 year old boy. He’s energetic, athletic, and can run laps around me, but I’d like to do something I’ve never done and do whitewater rafting with him. But damn, they are so expensive. Any tips on outfitters that might have kid discounts? Or am I really stuck paying 7 grand for a week rafting? I’m just blown away by the prices.