Solar Food Dehydrator page, build it yourself
Electric, non commercial food dehydrators range from the inexpensive Snackmaster ($49) to the and the top of the line 9 tray 15 sq ft Excalibur ($200). The economy version of the 9 tray Excalibur (Model 2900 does not have a timer) is available for $180 from sources found on the web. The timer is not needed since food cannot be over dried. If a timer is desired for other reasons, it is much cheaper to purchase an electric timer from a big box store.
Solar Dehydrators, Build It Yourself
A $10 or less homemade solar dehydrator from cardboard boxes.
Three designs for downdraft solar food dehydrators