For only $10, you should have already placed your order by now. You'll only have yourself to blame if your true love walks into a dragon mug situation unarmed.
Lord of the Rings ... Um ... Ring
Jewelry is always the go-to gift if you have the blood money to fling around. The way I see it, if you're going to get a ring, you might as well get the one that oppresses all the other ones. It's 18-karat gold-plated tungsten carbide, and it'll run you around $100, which isn't that bad, considering that the last person who had it paid for it with the lives of the innocent and shitloads of walking.
And if you wanted to go full-on geek and dare to cross your nerd genre streams, you could always gift wrap it in a companion cube box from Portal. Just make sure the recipient can handle that much awesome all at one time, though. You don't want to have to clean up their exploded remains on the year's most romantic day.