The 3D printers you can get cheaply use fused deposition, which I wouldn't trust as a lower. The materials they use are also not suited to high temperature. As a grip or a stock, great, but as a lower, I would be really, really careful.
The biggest advantage I've found to granite is that you can't melt it. If you pull the skillet off the stove, you don't have to hunt for a pad; it can go directly on the counter.
That's probably true of quartz as well, but is not true of faux-granite appliques. The premium you're paying is...
For compressed gasses, you're generally looking for a welding supply shop.
It looks like this place is just up the road from you: http://www.mathesongas.com/. Maybe try calling them?
All the way down in St Mary's, International Beverage is a surprisingly good bet. They're a bit hit-or-miss with whether they have Lagavulin in stock though.
Hey folks.
I went looking for an HBAR Barrel, 16 inches, fluted to minimize weight, and found the following. Anyone have any experience with the vendor, advice, or alternate options...