Starting out with Guitar Recording in Garageband

I started playing guitar about 2 years ago, and I'm just now starting to get interested in composing my own material. Im on an extremely tight budget (I'm broke after buying my first Mac 😝 Though I'm very happy with it.) I earlier tried plugging the guitar just strait in (after checking around a bit I didn't expect a whole lot) I found a lot of noise and distortion like I figured. I tried using a cheap amp I own as a pre-amp of sorts, but this just made the problem worse. Its pretty clear that I need another way to record other than the Line-In on the pro. I've looked at USB solutions, but I can't find one that seems to be generally considered "good" for under $200. I'd really like to keep my costs for starting out under $100 if possible. At any rate, if anyone has any suggestions it would be greatly appreciated. Thanks!