Unless the rules have changed, when I got my first one my parents bought it for me and then wrote a note of authorisation to allow me to pick them up to confirm it was intended to be collected by me and for use by me.
Alternatively last year when I bought one at a park I wasn't asked for ID so unless they've buckled down on it then you should be fine, but I'd get them online and collect on the day with letters authorising you to get them if I was you as an air of precaution