I've always wanted some, and an opportunity to purchase it arose. Set me back almost $500 but it's a pretty good deal considering how hard it is to get ahold of.
I bought it from this guy, $236 for a bottle. Please only buy it if you know what you're doing, as it is very bad for the environment and your health if it's spilled or handled improperly.
Yeah it's a shame it's so dangerous. You can get alloys like Galinstan that are liquid at room temperature, but they tend to stick to stuff and aren't nearly as dense.