John wants to get a basic internet that doesn't offer TV or phone or anything else: just basic internet. Leo says that ISPs tend to charge you more for basic internet, vs. one that offers a bundle with phone and TV service. But they are required to offer "dry loop" internet service which may be cheaper than a plan with phone and TV service. Your other option is to use your cell service since it has data anyway. MINT Mobile is a possible solution. They are much more affordable, starting at $15 a month. Ideal, when money is tight. Also, call City Hall and see if there's municipal WiFi available in your city.
Also, check out InternetEssentials.com. Internet access starting at $10 a month.