Audio for your website is amazingly easy to record these days. Here are a few of the resources I use and recommend.
Does your computer come with a microphone? Then this is probably the easiest way to record audio in a digital format.
Most cell phones have a short message recording feature. If what you need to record will be short and pithy, this is a good way to go.
Digital Voice Mail Services
There are several companies that will assign you a phone number that you can use as a voice mail service. When anyone leaves you a message, you are then sent the digital file by email. The service I use, MaxEmail, costs about $25 per year and also lets me receive faxes.
Free Conference Call Services
There are a plethora of free conference calls services available. I use both FreeConferencePro.com and FreeConferenceCalling.com. With the former, someone else has to be on the line in order to record. However, since Free Conference Calling (originally The Basement Ventures) was created with podcasters in mind, you can be the only one on the line and still record.
Most of these services will provide you with the audio in either .wav or .mp3 format, sometimes even both. For the web, it is best to have it in mp3 format, so that it is compatible with more platforms. I found an excellent website that can covert your file for free. Just go to zamzar.com.