Let the hive mind of Engadget get that for you.
"What is the best wireless surround sound speaker solution? I have a home theater where running wires is just not feasible. I have my own speakers, so I don't want a system that has speakers with integrated wireless. I've done a far amount of research and have only come across a few companies that even offer a reasonable solution: KEF, Kenwood and Rocketfish. Is there anything else out there? What do you recommend? Thank you!"
I just cut a hole in the back of a dresser and made one of the bottom drawers serve this purpose.
However, i'm not sure why you think $30 is too much for this. After you bought the plastic for this and did the work $30 would be less unless your time is worth less than $20 an hour.