Other than those PVC pipe-frame systems that are large enough to stand with their own support legs, reflectors that I know of, don't come on stands as such. You buy reflectors (and flags and scrims) and use clamps and stands to hold them in place. As such, you use anything you want. I have California Sunbounce units but I hardly ever use them inside. Most of the time we just use sheets of white foam core, and occaisionally one cover in silver krinkle foil or even a mirror-like surface for special situations.
Andy Pearlman Studio