Yes, wave audio files an get pretty big. Have you considered compressing the audio?
There are a number of programs around that can compress audio into different formats. You can find encoders at Real, MP3.COM and Microsoft. These will all take wave audio files and convert them to another, compressed audio format such as Real Audio, MP3 or Active Streaming Format. Out of all of these, the MP3 format seems to be the most popular among scannists.