This just expands on MyUncles comments:
GoTo
http://www.socketcom.com/product/default.asp
for an overview of their CF products
They have a moderately priced connectivity solution for just about any issue. Some of these products are availble from Dell at a lower price. The LinkSys WiFi solution seems to be one of the lower in cost available. LinkSys makes good stuff.
Once you've been to Socketcom's site,you'll have a lot better idea of what is available. You may find competing products that are lower in cost. At some point "penny wise, pound poor" kicks in.
:P