in my bedroom, I have 3 mattresses set up like gobos. 8) Get creative with couch cushions, packing blankets, and walk in closets, whatever you can get your hands on. it'll be a lot cheaper, and probly more effective.
we have some se reflexion filters at our real studio, but no one really ever uses them. seems to freak some singers out. i dont think they do that great a job either, but definitely better than nothing.