Reddit mentions of Koplow Games d20Single55mm CountdownIV Bagged

Too many dice is not a thing. You could also look at novelty dice. A player got me a D100 once. It pretty much looks like a golf ball and it's highly impractical, but it's pretty cool and I have it on display on a shelf. Another player got me an oversized D20 that I placed next to it.

Aside from that, if you know what your DM is into outside of gaming, get something related to that. I had a DM who was obsessed with Spider Man so I got him a Spidey T-shirt one year. Worst comes to worst, bake something.

http://www.amazon.com/Koplow-Jumbo-Opaque-Countdown-Ivory/dp/B001F2S8G0/

Generally those big ones are countdown dice. The numbers are adjacent to the next higher and lower numbered faces so the DM can count down rounds to some event dramatically. Unless you give them a huge roll they are very easy to game for a high or low roll (half the dice is all high numbers, half all low). non-affiliate Amazon link