Someone will probably recommend other stuff, because I'm not as familiar with Beardie's and such,  I'm a snake kinda gal, haha But one good burrowing substrate for snakes is a "sani-chip" style aspen. Native Earth on amazon.com has it 2.2 cu. ft. for $7. My Kenyan Sand Boa, Sig, loves it. and even my Corn's who don't have the urge to burrow like a KSB, still enjoy doing so in it sometimes.Though Beardie's obviously have different needs. I did see a lizard recommended type of "clay diggin/building substrate". I'll see if I can possibly find it again for you. I may've been a Beardie in the pic with the product, can't recall.  But its for burrowing reptiles who enjoy digging out a whole into a surface, and it looked really snazzy and fun  for them. I'll see what I can find. =] 

Found it...it makes being a burrowing reptile look fun =p. http://www.zoomed.com/db/products/EntryDetail.php?EntryID=188&DatabaseID=2&SearchID=3  There's a link to the one I saw I'm pretty positive. It allows you to make and shape whatever you want out of the powder clay, and a water mixture (is the way I understand it). then your animals can dig and burrow, and make tunnels and stuff! There's and instructional video on that link too. Good luck!

And it does say its excellent for Beardie's, and shows a lot of them in the video. I'd recommend the video, it talks about the product, and how to use it, and gives you ideas of how to mold it and stuff. Pretty helpful and cool.

ok, cool. thanks. we have snakes to, 3 red tails and 3 balls. one of the beadies was a rescue and the other my bf got as a baby. they are so much fun. we'll look into that link. thanks!

Honestly, beardies shouldn't be on a particle substrate. They tend to be somewhat prone to impaction. You can give him a box to burrow in on one side of the enclosure, away from his food, etc, to reduce ingestion risk as much as possible, but he doesn't necessarily need it. A few good, secure hides and some good climbing branches do great for a beardie.

Slate or tile makes the best beardie substrate.

I’ve always used sand. As long as the beardie is even a decent hunter, you aren’t really at risk for impaction. It’s easy to clean and they can burrow a little into it for cooler temps.

I've kept beardies forever (well, not FOREVER, but you know) - and the only ones that are remotely interested in burrowing are the gravid females or the brumating males. I keep my adults on sand as well and have never had a problem (granted, my beardies generally solely eat dubia and hornworms and greens and are fed out of ceramic bowls - but they're NEVER kept on sand until they're at least 12 - 15" long). I used slate/tile for a while, and found it got EXTREMELY hot under the heat lamp because the ceramic is a relatively good conductor of heat, and I didn't want anyone to sustain a belly or a foot burn. 

To alleviate your dragon's apparently desire to dig to China, I'd recommend a large hide with either the Excavator substrate (as discussed earlier) or a densely packed combination of EcoEarth and sand underneath it. It has to be moist, or there's zero fun in digging in it! :) - keeping it in only a portion of the cage will help to keep the inherent "mess" in check. The fact that it's within the hide will be particualrly appealing to Nero if he is indeed looking to bury himself and brumate for a while :-)                              ---  also, I used the Excavator substrate with my uromastyx, and he looooooooooved it!

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