October 1, 2018 Update: Original listing creator Molten Plastic appears to have removed his/her Dice Tower designs from Thingverse. The current link leads to another set of plans from Lau 85.
You'll find the Dice Tower files and material suggestions for 3D-printing your own RPG D-rolling tube on Thingverse, courtesy of designer Molten Plastic. It's one of several dice tower downloads available on the MakerBot community site, but, sorry dudes, no one is selling them there pre-made.
If you like the idea, but haven't got a 3D printer, you might be able to find similar versions elsewhere, or check out this take on the dice tower theme from Etsy shop The DM's Treasure Trove. Totally different, but I think equally distinguished.
One thing I like about Molten Plastic's 3D-printed tower is that the clear plastic forming his (her?) enclosure cylinder is from a 1.5L Smart Water bottle. Talk about recycled art.