my son was sufficiently excited to see me getting a board, so I would like to use this opportunity and set him up with a lesson if I wait too long his interests might shift.
- a requirement as I see it => a kid's sail/rig

where should I start poking around? Southport Rigging?
thanks in advance

Where are you located, Andy?

If you're near Evanston, this may be your best option: http://northwesternsailing.com/camps

Aleksey, thanks - I saw that.
unfortunately they only offer half-day camps which makes logistics rather hard for the working folk.

I am maybe 40 mins away though (NW suburbs) - if only they'd offered kids classes on weekends....
I signed up myself for the adult one.

We bought the Ezzy Kids Rig Pkg to teach our son when he was small. It is reasonably priced and comes with two sails.

www.windance.com/Ezzy-Kids-Rig-Pkg-2.0-2.5-WSSL34852025/

We upgraded to Sailworks Ripper Sails when he outgrew the Ezzy sails. We have a 2.5 and a 3.3. This is a higher quality rig. In fact, I use the 3.3
when the wind is high.

www.sailworks.com/the-gear/sails/ripper.html

Greetings. Just wanted to put in another plug the Northwestern University Sailing Center (NUSC). I learned how to sail there, and the place has gotten even better over the years. In addition to a beautiful new launch facility, NUSC recently purchased a bunch of new JP boards (JP Explorers, with daggerboards), as well as new RRD and Ezzy sails. They rent SUPs (Bic Ace-Tecs) as well. Hope you enjoy your lessons there, Andy!