Not sure about Op's setup, but an easy one to get into is uRad[1]. Along with logging it'll share it around the globe for finding any kind of event like this. Though I'm not sure that they've got any kind of statistical analysis going on.
Their indiegogo put it at $90 for a kit to solder, and $120 assembled. No idea what the cost is now since you've got to email them on their website to get one it appears
http://www.uradmonitor.com/