Give us a little more information. What do you want to use your wireless link for? Is this going to be for a single user or multiple users? Is the user/users going to be mobile within the range of the wireless access point or stationary? Do you currently have a wireless access point?
It might be do-able for $100 but you will need to have the access point. As I noted before, power can be an issue depending on how the network is setup. If cable is needed, I could hook you up with some at no cost in exchange for some secret fishing spots (although I don’t like anything with whiskers).
Give us a little more info and we might be able to better help.