I have a 25$ (for new) 2.1 (well not really a 2.1, but...) Logitech S200. People often make such preposterous claims, so here's mine
"If you're buying new speakers, you'll never get better sound for 25$ than s200".
But, it is only this model. I was so surprised by the sound that I wanted to buy a pair for a friend of mine, but the S200's were out and in came the S220, and they simply didn't sound as good. Someone obviously put some effort and thought into S200 and was, of course, fired subsequently for endangering the company
.
I'm not comparing this with monitors, but for that price, I simply never heard anything better.