One of the deals on Target today, 9/3/12, is for a Marpac Dual-Speed Sound Machine for $39.00, regularly $54.99. This is the cheapest price I’ve seen on these I think.
We own one of these as my daughter was a light sleeper and would wake constantly as a baby. This machine was a lifesaver for us as we finally got sleep after buying it!
If you like the sound that is similar to a fan when you sleep, this is a great little thing to buy.