I feel everyone's pain trying to find the tee fittings that at this point Harbor Freight doesn't remember ever having
I too had a bit of trouble locating them. That is until I happened to look at the scaffolding we were using to paint the house and then, much to my amazement, the hand rail at the store we rented it from. It seems both use the same tee fittings. Check out these sites[url="http://www.boundary-fences.com/quickrail1.htm"]http://www.boundary-fences.com/quickrail1.htm[/url] then scroll down to item 160
http://www.farmtek.com/farm/supplies/pr ... 05957.html
The price may not be $0.87, but hey, we can't all be so lucky
I picked mine up from boundary fence for five bucks each and scored free shipping. They work great so far for carrying my canoe, and not to restart an old argument, but I didn't have to bend the pipe 
Some of the other fittings they carry look pretty interesting too. I'm thinking of some custom light mounts from #185.