atsacoustics.com has the most cost effective acoustic panels I've seen (apart from DIY, which they can also supply materials for). Their standard panels have a wood backing, but they also sell them without the wood backing for the best absorption in a corner.
small room questions
i will soon have a dedicated room for my audio and was wondering if it is possible to get good sound in a 10'x 11' room. i currently have a set of sonus faber toy monitors on stands and a rel t2 sub. the room will be completely bare other then a chair, audio rack, and audio equipment. i have about $600 i can spend on treatments. i have read about setting the speakers diagonally in the room to help cancel room nodes, but dont really know where you would put the sub. anybody been able to tackle a small room with success??