I recommend purchasing a Delta wave CD, that you can have play several times while you fall asleep. These are highly scientifically researched to reduce stress and enduce sleep and dreaming. You can do a Delta Wave google search and find several types...

The white noise players are available at electronic stores, departments stores etc and you should not pay more than $20 for sure... you can pay less but be careful, they might be battery operated only. Some have buttons to select tropical sounds, ocean, etc.