If you do not mind running the cable through your house across the floor, you can buy a long Cat 6a cable for less than $15 and connect your pc that way. It is what I do on my main machine.
What router do you have and how fast is your internet plan? If you already have a slow internet plan, a speedy wireless router will do you no good, in fact, trying to use Wi-Fi on a slow internet plan won't be an enjoyable experience at all.