Wierd that you guys like the L&M brand of Aspen, I ordered it from online cause there isn't any place that sells it locally, and I hated it. It wasn't soft like I think shavings should be, it was more like wood splinters and quite dusty.
Right now I'm using Kaytee Aspen, as it's cheaper and I can save on shipping and you just have to look through the giant compressed bags at the shaving quality. Some will be really dusty, but most I've had have been just fine. Although I did get one bag one time that I had serious doubts that it was aspen in there. It looked and smelled like spruce chips, not to mention the chips were greasy feeling. Needless to say I used that as chicken bedding.
Reptibark I wouldn't recommend for corns. I tried it once, and it was so dusty it was clogging their nostrils, and I could just imagine what else it was doing. And I even rinsed/drained/baked it before adding it to their vivs. There's just something about fir bark that makes it powdery. Although I did get a similar product from ESU for my BP tank that wasn't dusty at all, and even came moist in a bag. Not dry and powdery like Reptibark is.
As for beech chips, try contacting a lumber company and see if they have any ideas. If I remember right from college biology class, beech is a predominant tree in northern Europe, hence why its used so frequently over there.
Another source you may look at is orchards...they put wood chips under their trees to keep grasses and weeds down and most use hardwood chips, not conifer which would degrade faster.
And yet another source would be horse bedding materials. They too use hardwoods, as they stand up better to a heavy animal tromping round. You may call up some local stables and see what they use as bedding and if they know of any place to locate beech chips.
Me, I don't think I could consciously use beech chips. Around here they're such a slow growing tree, and it takes eons for one to get big enough to be valuable to loggers. Maybe in Europe they can grow fast enough to replenish themselves. But they don't call them the 'Queen of the Forest' for nothing (Oak being the 'King of the Forest').
Aspen is much more environmentally friendly, as aspen grows like weeds out in the mountainous western US and it can replenish itself faster than most other softwoods.
Unless you want to use paper towel or newspaper, no other wood shaving type of material is going to be completely free of dust/powder. Them's just the apples of wood products. =)