使用JavaScript在运行中生成文本的网页从Java中解析文本

I like playing Magic: The Gathering, and I also have a database of my collection. Magic set information was easy to obtain, since I could parse it directly from the HTML URL stream I opened, but I'm now trying to obtain prices for the cards as well from Star City Games (a MTG vendor). However, when I view source, there are no prices in the HTML; it's all done through JavaScript on-the-fly. Here's an example page for reference: I like playing Magic: The Gathering, and I also