I have a pair of Bobby's Tack side reins. They are leather with the donut, and they are very nice quality. If I remember correctly, I paid right around $50.00 for them. Very pleased.
As far as a surcingle, I have one that I purchased from Dover and really like that as well. I use a surcingle pad with it, and that I purchased from Dressage Extensions. I used to use baby pads or a simple a/p pad under the surcingle but found that they shifted too much for my liking....the surcingle pad stays in place.
If you are interested in a quality lunging cavesson, Dressage Extensions carries one that is soooo nice (yes, I have that as well....lol). I can get the item # if you're interested.
Hope that helps.