Yes, I gather the kit is scarily expensive! I found a course that will take 8 year olds + (DS1 is 10.5) and they supply the gear for the beginners course. Might give it a go. DS1 does karate but isn't into team sports at all.
I started doing archery at school when I was a teenager and carried on when I was at university. It was a great way for me to meet a whole set of different people. I never owned any of my own kit - you could always borrow from the clubs (ok, so it wasn't the best kit!). I have a happy memory of shooting at a big competition and using a welly boot for a quiver!