There's a video on youtube of a guy making oil with isopropyl alcohol, but it takes a lot longer.

Basically, he dumps the weed into a jar of isopropyl alcohol and lets it sit for a long time so the THCA and stuff dissolves into the alcohol. Then he runs it through a coffee filter to strain out the green matter, pours whats left onto a dish, and lights it to force the isopropyl alcohol out. I'd go with butane, it seems safer and cleaner, and I'm not entirely sure as to how burning the isopropyl alcohol would affect the THC and stuff. You should be able to get butane pretty easily, ask around at drug stores and grocery stores. Say you need it to refill your lighter, or even your dad's lighter if you're a kid.