John, I've got one of those collapsible reflectors. If you get one, avoid the one with the hole in the middle made to put over the front of your lens. Its a PITA to use one the camera and if you try to use it off the camera the hole in the middle kinda messes things up. It can be used that way and I have but you really have to be using tripod or have someone with you to hold the reflector. They really can help though. I think adorama sells a couple that are double sided one flat white and the other another color of your choosing to add a different hue to things.
Thankfully the one I do have didn't cost very much so it's not that big a deal.