Play stereo sound on any surface

These stick-on any surface speakers, allows for transmitting stereo sound on any thin walled high transmission surface (i.e. posters, bookcases, tables, doors). The drawback is that these are meant for permanent sticking on the chosen surface. The speakers have an impedance of 8 ohms. US$17.99. I can't imagine how good quality sound one can get out of these.

[Sonic Impact SoundPads]