I'm a bit of an oddball in that I love such things as Basalt and Granite, which sadly get little to no recognition in metaphysical communities. However, I'm also partial to things like Hematite, Onyx, Obsidian, and Quartz. I have a semi-extensive (about 50-75 stones, not counting beads, charms, jewelry pieces, etc) collection, but I'm always expanding. It's about half rough stones (most of these natural rough Minnesota quartz, very nice) and half tumbled, polished, or cut stones (most of these were purchased).
I recently came across this website, which sells rough Lake Superior agates, among other things. I ordered myself a little one from there (about 10 bucks). I've always loved the energy of agates that I've purchased, but mine hasn't arrived quite yet so I'm still waiting to see about this one.