Although, admittedly, my favorite K-cup holder is still this one, Amazon just had a price drop on this 36 K-cup drawer, now $19.95 with free Prime or SuperSaver (minimum $25 purchase) shipping. It strikes me as a great space-saver since you can put it under your Keurig, and it got 4 out of 5 stars over 76 customer reviews:
I can finally get rid of the five boxes of K-cups sitting on my counter. The padded top of the drawer shelf means I don't get a rattling vibration noise when the brewer runs, and the drawer slide action is very smooth. The drawer extends far enough out that it's easy to get the last cup in a row, so you can see all the cups at once - much better than digging around in a bunch of boxes. The whole thing feels very sturdy, and has a nice modern look to it.
The only negative that I spotted in the reviews is that it raises the level of your Keurig by about 3-4", so make sure you have the clearance space between your counter and the bottom of your cabinets. Everyone seemed to rave about the vibration-absorbing rubber mat that comes on the bottom of the drawer, and this seems like a practical, attractive, well-made K-cup storage. Get this 36 K-cup drawer for just $19.95 here.
If for some reason, the price changes or this sells out, you can get what looks like the identical product at the same price here as well.