Game dice.
I've been playing DnD and World of Darkness for a little while, but I kept mooching my friend's spare dice since I didn't have a set of my own. I decided to run to a comic shop near by to pick up a transparent red d20 set (d4, d6, d8, d10, d10p, d12, d20) for $6 and, for World of Darkness, 10 extra d10 from the "$.50 each" bin. It works out a lot cheaper to grab bag your own set but the likelihood of getting a matching set is slim. Threw a spare d20 in there because why not.
Cost me $11.50 in total.
Now I am working on making a chainmail dice bag, shown in the pic.